PROGRAMS

Basic Programs

• Sum of two numbers on c++ 
• Program to demonstrate signed and unsigned number in c++
• Program to print a car simply using text characters in c++
• Program to print heart simply using text characters in c++ 
• Program to show importance of getch and clrscr in c++ 
• Program which show importance of getchar in c++
• Program to show importance of getche in c++ 
• Program which demonstrate input output of 2 dimensional array in c++ 
• Program which demonstrate recursion in c++
• Program which show range of integers and other data types in c++ 
• Program which evalute the expression evalute x+pow(x,2)/2!+pow(x,4)/4!+_______ pow(x,n)/n! in c++ 
• Program which evalute the expression evalute z+z*z/2 +z*z*z/3 +z*z*z*z/4 in c++ 
• calulate-gain-in-amount-by-adding-11 

• Program which find the average of n numbers in c++

Programs of Patterns  

• Program to print address simply using text characters in c++ 
•  Program to print Hut using loop in c++ 
• Program to print hut using loop with security code 
• Program to print Pattern of pyramid in c++ 
• Program to print triangular pattern in c++ 
• Program to print double pyramid in c++ 
• Program to print diamond in c++ 

 Programs of Recursion

• Program to print fabonacci series using recursion in c++ 
• Program to find factorial using recursion in c++ 
• Program to find the sum of n numbers using recursion in c++ 

Programs of Function 

• Program to show basics of functions using c++ 
• Program to find HCF using functions in c++ 
• Program which takes a number and return the sum of its digits using function 

Programs of String & Pointer

• Program to convert a string into lower case without using inbuilt function in c++ 
•  Program to convert a string in uppercase without using inbuilt function  
• Program to demonstrate periority of increment and decrement operators in c++ 
• Program to show single character at the cursor position in c++ 
• Program to print a random number in c++ 
• Program to remove first and last occurance of a character in c++ 
• Program of selection sort in c++ 
• Program to reverse the string without using inbuilt function 
• Program which show the basics of pointer 
• Program to count characters, words & lines in the string in c++ 
• Program to count vovels,digits,spaces,consonent and other characters in a string in c++ 
• Program to sort a string in c++ 
• Program to find number of substrings in a string in c++ 
• Program of password, where you write your password and it print in the form of stars  
• Program of dynamic merge in c++ 
• Program of dynamic sort in c++ 
• Program to toggle a string in c++ 
• Program which convert float value to string in c++ 
• Program which demonstrate use of gotoxy 
• Program of merge sort in c++ 
• Program to calculate occurance of word in the string in c++ 
•  Program to find the factorial of large number in c++ 
• A string of charater is given.Find the highest occurance of a character and display that character. eg.: INPUT: AEGBCNAVNEETGUPTAEDAGPE, OUTPUT: E or I,J(if equal occurance) 
• Two sentences are given and we were required to print the common word in the two sentences. Words were delimited by space, full stop, ? , ! and , . The trick in the question was that common word should be printed only once so if ur first sentence contains two word "how" and second contains "how" then in output how should be printed only once for this u can replace each matched word in second sentence by spaces  

Programs of Array 

• Program to find the transpose of matrix in c++ 
• Program to find largest number in each row of the matrix in c++ 
• Program to find the sum of rows of matrix in c++ 
• Program to find the sum of diagonal elements of matrix in c++ 
• Program to sort the array using function in c++ 
• Program to search a number present in number of times in the array and also find its location in c++ 
• Program to find the product of matrix using c++ 
• Program to simply insert elements in the array in c++ 
• Program of binary search of elements which are already sorted 
• there is a matrix N x N .Its elements consist of either value =1 or value=0. If there is a any zero in the row, then the output matrix should have all zeroes in that row. If there is a single zero in any column then that column should have all zeroes n the output matrix. write the function to perform these operations 

  


Programs of LinkList

• Program to show basics of link list in c++ 
• Program to count number of nodes in c++ 
• Program to count odd value nodes in c++ 
• Program to search a node in c++ 
• Program to search a node by value and replace it with next node 
• Program to search a node and remove it in c++ 
• Program which demonstrate use of tree 
• Program to remove alternative nodes in linklist in c++ 
• Program to reverse linklist in c++ 
• Program to enter name and email of student using linklist 
• Program to show insert and deleting in queue in c++ 
• Program to remove duplicate node in c++ 
• Program to insert element in queue in c++ 
• Program to convert binary number into decimal number in c++
  

Intermediate Programs

• Programs to find the roots of fourth order algebric equation in c++ 
• Program to solve three variable algebric equation 
• Program of simple railway reservation 
• Program to replace a substring with another substring with same or different length in c++ 
• Program to reverse each word of string in c++ 
• Program to save the graphical output of c++ 
• Program of sparse matrix in c++ 

Programs of OOPS

• Program to add, subtract,multiply 2 complex numbers using classes in c++ 
• Program to find area and circumference of circle using classes in c++ 
• Program to demonstrate inline functions in classes in c++ 

Programs of basics of graphics 

• Program to print rectangle without using inbuilt functions in c++ 
• Program to print rectangular bowl without using inbuilt function 
• Program to print 'c graphics' in the line without using inbuilt graphic functions in c++ 
• Program to print menu without using inbuilt graphics functions 
• Program of loading in c++ 
• Program of loading 2 in c++ 
• Program to moving boundries like game in c++ 
• Program to print all the ascii values of c++ 
• Program to print a barcode in c++ 
• Program to print a line in c++ 
• Program to print welcome screen in c++ 

 Programs of Advanced graphics

• Program to demonstrate the use of setfillstyle in c++ 
• Program to select different background colours 
• Program which demonstrate the use of text styles in c++ 
• Program which demonstrate use of line styles in c++ 
• Program to demonstrate use of text size in c++ 
• Program to print a graphical baby in c++ 
• Program of graphical loading like window in c++ 
• Program to print graphical loading 2 like window loading in c++ 
• Program to print mickey mouse in c++ 
• Program to print a variable box for text editor in c++ 
• Program to print database using lighted moving bulbs around the menu 
• Program to print menu base in graphics in c++ 
• Program to print menu in very good graphics form 
• Program to enter the values in student database in c++ 
• Program to enter the values of data of form in boxex and by pressing enter cursor goes to second box in c++ 
• Program to print main menu in graphics in c++ 
• Program which define the pixel on screen while moving the mouse cursor on the screen ion c++ 
• Program to draw line with the help of mouse on the screen just like paint in c++ 
• Program of moving three dimensional rectangular box in c++ 
• Program of main menu working with mouse using c++ 
• Program which take a number from keyboard and returns its ascii value, scan code, status code in c++ 
• Program which draw rectangle with mouse just like paint in c++ 
• Program of digital switches in c++ 
• Program to show the basics of screen saver in c++ 
• Program of text box in c++ 
  

  

If u have ur own code, u can post it here so that others can take benefit from it

Form
Creator by  - Privacy

If ur program is very big, u can also post it on this email: er.upinder.dhami@gmail.com

Projects and games

• Project of complete editor just like notepad in c++ 
• Project of banking in c++ 
• Project of hostel management in c++ 
• Projetc of three dimensional calculator working with mouse in c++ 
• Graphical project of student database in c++ 
• Source code of shooting game in c++ 

Two sentences are given and we were required to print the common word in the two sentences. Words were delimited by space, full stop, ? , ! and , . The trick in the question was that common word should be printed only once so if ur first sentence contains two word "how" and second contains "how" then in output how should be printed only once for this u can replace each matched word in second sentence by spaces .

#include<iostream.h>
#include<conio.h>
#include<string.h>
#include<stdio.h>
void main()
{    clrscr();
    char str1[500],str2[500];
    char substr1[50][50],substr2[50][50];
    for(int l=0;l<50;l++)
    {    strcpy(substr1[l],"");
        strcpy(substr2[l],"");
    }

    cout<<"enter the first string: ";
    gets(str1);
    cout<<"enter the second string: ";
    gets(str2);
    int i=0,index=0,s1index=0;

    while(str1[i]!='\0')
    {    if(str1[i]==' '||str1[i]=='?'||str1[i]=='.'||str1[i]=='!'||str1[i]=='_')
        {    for(int j=index, k=0;j<i;j++,k++)
            {    substr1[s1index][k]=str1[j];
            }

            substr1[s1index][k]='\0';
            s1index++;
            index=i+1;
        }
        i++;
    }
    index=0;
    s1index=0;
    i=0;
    while(str2[i]!='\0')
    {    if(str2[i]==' '||str2[i]=='?'||str2[i]=='.'||str2[i]=='!'||str2[i]=='_')
        {    for(int j=index, k=0;j<i;j++,k++)
            {    substr2[s1index][k]=str2[j];
            }

            substr2[s1index][k]='\0';
            s1index++;
            index=i+1;
           }
           i++;
    }
    cout<<"repeated words are: ";
    i=0;
     //    for(int g=0;g<5;g++)
     //    {cout<<substr1[g]<<endl;}
     //    for(int d=0;d<5;d++)
     //    {cout<<substr2[d]<<endl;}
    while(strcmp(substr1[i],"")!=0)
    {        int j=0;
         while(strcmp(substr2[j],"")!=0)
        {      if(strcmp(substr1[i],substr2[j])==0)
            cout<<substr1[i];
            j++;
        }
        i++;

    }
    getch();



}

A string of charater is given.Find the highest occurance of a character and display that character. eg.: INPUT: AEGBCNAVNEETGUPTAEDAGPE. OUTPUT: E or I,J(if equal occurance)

//to find the charater which is repeated most time in string
#include<iostream.h>
#include<conio.h>
#include<stdio.h>
void main()
{       clrscr();
    char ch;
    struct node
    {    char info;
        node *link;
    };
    node *start,*q,*p,*r;
    start=NULL;
    cout<<"enter the string: ";
    while((ch=getch())!='\r')
    {       cout<<ch;
        node *p=new node;
        p->info=ch;
        if(start==NULL)
        {    start=p;
            p->link=NULL;
        }
        else
        {       q=start;
            while(q->link!=NULL)
            {    q=q->link;
            }
            q->link=p;
            p->link=NULL;
        }
    }
    char record[50];
    int count[50],idx=0;
    for(int i=0;i<50;i++)
    {    record[i]=NULL;
        count[i]=0;
    }

    while(start!=NULL)
    {       p=start;
        ch=start->info;
        while(p!=NULL)
        {       q=p->link;
            if(q->info==ch)
            {       p->link=q->link;
                delete q;
                count[idx]++;
                continue;

            }
            p=p->link;
        }
        if(count[idx]==count[0])
        {    record[idx]=ch;

            idx++;
        }
        if(count[idx]>count[0])
        {       count[0]=count[idx];
            for(int i=1;i<50;i++)
            {    count[i]=0;
                record[i]=NULL;
            }

            idx=0;
            record[idx]=ch;
            idx++;
        }
        start=start->link;

    }
    cout<<"\nmaximum occurance numbers are: ";
    i=0;
    while(record[i]!=NULL)
    {    cout<<record[i]<<", ";
        i++;
    }

    getch();
}

program to convert binary number into decimal number in c++

//binary to decimal conversion
#include<iostream.h>
#include<conio.h>
#include<math.h>
#include<stdlib.h>
void main()
{       clrscr();
    int num[50];
    char ch,st[2];
    for(int i=0;i<50;i++)
    num[i]=-1;

    i=0;
    cout<<"enter the binary number: ";
    while((ch=getch())!='\r')
    {
        cout<<ch;
        st[0]=ch;
        st[1]='\0';
        num[i]=atoi(st);
        i++;
    }
    int max=0,sum=0,m=0;
    while(num[max]!=-1)
    max++;

    max--;
    cout<<endl<<endl;
    while(max>=0)
    {    sum=sum+(num[max]*pow(2,m));
        max--;m++;
    }
    cout<<endl<<sum;
    getch();

}

there is a matrix N x N .Its elements consist of either value =1 or value=0. If there is a any zero in the row, then the output matrix should have all zeroes in that row. If there is a single zero in any column then that column should have all zeroes n the output matrix.

#include<iostream.h>
#include<conio.h>
void main()
{    clrscr();
    int mat[50][50],r,c,stack[500],id=0;
    for(int i=0;i<500;i++)
    stack[i]=-1;

    cout<<"enter the number of rows and columns resp: ";
    cin>>r>>c;
    cout<<"enter the elements: ";
    for(i=0;i<r;i++)
    {    for(int j=0;j<c;j++)
        {       cin>>mat[i][j];
        }
    }
    cout<<"ur entered matrix is: "<<endl;
    for(i=0;i<r;i++)
    {    for(int j=0;j<c;j++)
        {       cout<<mat[i][j]<<" ";
        }
        cout<<endl;
    }

    for(i=0;i<r;i++)
    {    for(int j=0;j<c;j++)
        {       if(mat[i][j]==0)
            {    stack[id]=i;
                id++;
                stack[id]=j;
                id++;
            }
        }
    }
    int k=0;

    while(stack[k]!=-1)
    {    for(i=0;i<r;i++)
        {    for(int j=0;j<c;j++)
            {    mat[(stack[k])][j]=0;
            }
            mat[i][(stack[k+1])]=0;
        }
        k+=2;
    }
    cout<<"after ur operation ur matrix become:\n";
    for(i=0;i<r;i++)
    {    for(int j=0;j<c;j++)
        {       cout<<mat[i][j]<<" ";
        }
        cout<<endl;
    }

    getch();
}

Solved Placement papers of different IT companies

Solved C& C++ technical paper of Nagarro

• A string of charater is given.Find the highest occurance of a character and display that character. eg.: INPUT: AEGBCNAVNEETGUPTAEDAGPE, OUTPUT: E or I,J(if equal occurance) 
• Two sentences are given and we were required to print the common word in the two sentences. Words were delimited by space, full stop, ? , ! and , . The trick in the question was that common word should be printed only once so if ur first sentence contains two word "how" and second contains "how" then in output how should be printed only once for this u can replace each matched word in second sentence by spaces  
• there is a matrix N x N .Its elements consist of either value =1 or value=0. If there is a any zero in the row, then the output matrix should have all zeroes in that row. If there is a single zero in any column then that column should have all zeroes n the output matrix. write the function to perform these operations 
• Program to convert binary number into decimal number in c++
• write a program to check whether the given number was of the form 3^n. ( i.e. 3 to the power n). 
• There are two sorted arrays, a1 and a2 of size n1 and size n2 respectively. array a1 is full, array a2 has exactly n1(size of array a1) empty space. Example, a1[]=1234, a2[]=56789_ _ _ _ Write a function to merge these two arrays to form a sorted array without any extra memory use. 
• suppose u r given a 4*3 rectangle like (take these values from user) Now u have to calculate the no. of squares in this rectangle like: No. of squares of dimension 1 is 12 No. of squares of dimension 2 is 6 No. of squares of dimension 3 is 2 No. of squares of dimension 4 is 0 Total no. of squares are 20.
  

Program to find the factorial of a large number

#include<iostream.h>
#include<conio.h>
void main()
{
clrscr();
int num,i,k,a[200],temp,index,n,x,test;
cout<<"enter the no. of test cases";
cin>>test;
while(test>0)
{
cout<<endl<<"enter the number ";
cin>>num;
k=num;
for(i=0;k>=1;i++)
{
  a[i]=k%10;
  k=k/10;
    }


   for(n=1;n<num;n++)
   {
   temp=0;

      for(index=0;index<i;index++)
      {
            x=a[index]*n+temp;
            a[index]=x%10;
            temp=x/10;
            }

            while(temp!=0)
            {
               a[index]=temp%10;
               temp=temp/10;
               index++;
               i++;
                 }
}
for(i=index-1;i>=0;i--)
cout<<a[i];
test--;}
clrscr();
cout<<"made by anil";

        getch();



        }

project of shooting game

#include<iostream.h>
#include<alloc.h>
#include<dos.h>
#include<conio.h>
#include<stdlib.h>;
#include<graphics.h>
void front_page();
void second_page();
void final_page();
    long o=0,g=0,a=20;
    float v;
    char w;
void main()
{    int gde=DETECT,gme;
    initgraph(&gde,&gme,"c:\\tc");
    mit:           //label
    front_page();
    w=getch();
    switch(w)
    {    case '1':v=1.2; break;
        case '2':v=2.0; break;
        case '3':v=5; break;
        default: goto mit;
    }
    cleardevice();
    int c=0;
    char *h;
    second_page();
    int maxx,maxy,area,x=580,ch,xdirn=1,ydirn=1;
    float y=25;
    void *buff;
    setcolor(WHITE);
    setfillstyle(SOLID_FILL,RED );
    circle(605,50,25);
    floodfill(605,50,WHITE);
    area=imagesize(580,25,630,75);
    buff=malloc(area);
    getimage(580,25,630,75,buff);
    maxx=getmaxx();
    maxy=getmaxy();
    while(1)
    {    putimage(x,y,buff,XOR_PUT);
        //delay(0);
        y=y+(ydirn*v);
        putimage(x,y,buff,XOR_PUT);
        if(y>maxy-50||y<20)
        {    c=0;
            sound(130);
            delay(5);
            nosound();
            ydirn*=-1;
        }
        int marea,m=98,n=235,ch,mdirn=1,ndirn=1,mn;
        int maxm,maxn,narea,buffn;
        void *buffe;
        setcolor(DARKGRAY);
        setfillstyle(SOLID_FILL,DARKGRAY );
        rectangle(98,235,105,239);
        floodfill(101,237,DARKGRAY);
        marea=imagesize(98,235,105,239);
        buffe=malloc(marea);
        getimage(98,235,105,239,buffe);
        maxm=getmaxx();
        maxn=getmaxy();
        gotoxy(2,10);
        int in;
        cout<<"BULLETS REMAINING = ";
        for(in=0;in<=a-1;in++)
        {    cout<<"!";
        }
        if(kbhit())
        {    mn=getch();
            char *bul;
            if(a==0)
            break;
            if((mn==115||mn==83) &&c==0)
            {    a=a-1;
                cout<<0;
                sound(9999);
                delay(10);
                c++;
                nosound();
                while(m<=maxm)
                {    putimage(m,n,buffe,XOR_PUT);
                    m=m+(mdirn*2);
                    delay(0);
                    putimage(m,n,buffe,XOR_PUT);
                    gotoxy(11,3);
                    cout<<g;
                    if(m==maxm-51 && (y<=235 && y+25>=205))
                    {    g=g+10;
                        o=g;
                        sound(2200);
                        delay(900);
                        putimage(700,25,buff,XOR_PUT);
                        nosound();
                    }
                }
            }
            else
            {    if(mn==27)
                break;
            }
        }
    }
    cleardevice();
    final_page();
    getch();
    closegraph();
}
void front_page()
{    setbkcolor(GREEN);
    setcolor(WHITE);
    setfillstyle(SOLID_FILL,RED );
    circle(505,190,50);
    floodfill(505,190,WHITE);
    setcolor(BROWN);
    line(0,235,35,235);
    line(0,235,0,258);
    line(35,240,35,235);
    line(0,258,35,240);
    setfillstyle(1,BROWN);
    floodfill(2,240,BROWN);
    setcolor(DARKGRAY);
    line(35,235,102,235);
    line(35,240,35,235);
    line(35,240,102,240);
    line(102,235,102,240);
    setfillstyle(1,DARKGRAY);
    floodfill(99,236,DARKGRAY);
    arc(35,220,250,310,25);
    line(35,242,38,243);
    settextstyle(1,0,1);
    setcolor(BLUE);
    outtextxy(200,300,"MADE BY :- MOHIT VASHISHT");
    outtextxy(200,317,"E_MAIL   :- mohitvashisht88@yahoo.com");
    settextstyle(4,0,5);
    outtextxy(200,50,"SHOOTING");
    outtextxy(250,120,"GAME");
    gotoxy(20,12);
    cout<<" 1 : EASY";
    gotoxy(20,13);
    cout<<" 2 : MEDIUM";
    gotoxy(20,14);
    cout<<" 3 : TOUGH";
    gotoxy(10,16);
    cout<<"ENTER THE LEVEL = ";
}
void second_page()
{    setcolor(BROWN);
    setbkcolor(YELLOW);
    line(0,235,35,235);
    line(0,235,0,258);
    line(35,240,35,235);
    line(0,258,35,240);
    setfillstyle(1,BROWN);
    floodfill(2,240,BROWN);
    setcolor(DARKGRAY);
    line(35,235,102,235);
    line(35,240,35,235);
    line(35,240,102,240);
    line(102,235,102,240);
    setfillstyle(1,DARKGRAY);
    floodfill(99,236,DARKGRAY);
    arc(35,220,250,310,25);
    line(35,242,38,243);
    outtextxy(10,35,"SCORE");
    outtextxy(10,50,"FIRE");
    outtextxy(50,50,"S");
    outtextxy(10,65,"EXIT");
    outtextxy(50,65,"esc");
}
void final_page()
{    setcolor(BROWN);
    setbkcolor(RED);
          for(int x=1;x<=4;x++)
    {
        clrscr();
        setbkcolor(RED);
        delay(100);
        gotoxy(31,12);
        cout<<"YOUR SCORE = "<<o;
        sound(2200);
        delay(750);
        nosound();
    }
    gotoxy(28,16);
    cout<<"PRESS ANY KEY TO EXIT";
}

graphical project of students database

#include<iostream.h>
 #include<conio.h>
 #include<stdio.h>
 #include<string.h>
 #include<process.h>
 #include<fstream.h>
 #include<dos.h>
 #include<graphics.h>
 #include "c:/tc/file1.cpp"
 #include "c:/tc/file2.cpp"
 char fname[]="c:/temp1.bin";

 class student
 {
     char name[20],fees[20],rollno[20],e_mail[20];
     public:
     int input();
     void output(int,int);
     int compare(char r[]);
 };

 struct node
 {
     student info;
     node *link;
 };

  class linklist
  {
     node * start;
     public:
     linklist()
     {
      start=NULL;
     }
     void file2list();
     void list2file();
     void insert(student);
     void show();
     void search();
     void delete1();
     void modify();
  };


  void linklist::file2list()
  {
      ifstream f;
      f.open(fname,ios::binary);
      student n;
      if(f.fail())
      {
       cout<<"\n FILE COULD NOT BE OPENED:";
       return;
      }
      while(1)
      {
        f.read((char*)&n,sizeof(n));
        if(f.eof())
        break;
        insert(n);
      }
      f.close();
  }


  void linklist::list2file()
  {
     ofstream f;
     f.open(fname,ios::binary);
     student n;
     node*p=start;
     while(p!=NULL)
     {
         n=p->info;
         f.write((char*)&n,sizeof(n));
         p=p->link;
     }
     f.close();
  }


  int student::input()
  {
     char s[4][50];
     int a;
     a=showform(s,4);
     if(a==0)
     return 0;
     else
     {
          strcpy(rollno,s[0]);
          strcpy(name,s[1]);
          strcpy(fees,s[2]);
          strcpy(e_mail,s[3]);
          return 1;
     }
  }

  void student::output(int x,int y)
  {
     outtextxy(x,y,rollno);
     outtextxy(x+100,y,name);
     outtextxy(x+200,y,fees);
     outtextxy(x+300,y,e_mail);

  }


  int student::compare(char r[10])
  {
     if(strcmp(rollno,r)==0)
     {
         return 1;
     }
     else
     {
          return 0;
     }
   }

void linklist::delete1()
 {     char temp[20];
       cout<<"Enter the roll no. whose record u want to delete:-> ";
       gets(temp);
       student n;
       node *p,*q;
       int i=0;
       p=start;
       q=p->link;
       if(start==NULL)
       {    cout<<"Linked list is empty";
        getch();
        return;
       }
       while(q!=NULL)
       {     n=q->info;
        if(n.compare(temp)==1)
        {    i++;
         p->link=q->link;
         q->link=NULL;
         delete q;
         cout<<"\n\n     Record is successfully deleted";
         break;

        }
        p=p->link;
        q=q->link;
       }

      if(i==0)
      cout<<"\n\n\n     NO RECORD FOUND";


 }
  void linklist::search()
  {
      student n;
      char k[10];
      cout<<"\n ENTER THE ROLL NO THAT U WANT TO SEARCH:";
      cin>>k;
      int z=0;
      node *p=start;
      while(p!=NULL)
      {
           n=p->info;
           if(n.compare(k)==1)
           {
            cout<<"\n RECORD IS FOUND:";
            n.output(100,80);
            z++;
           }
           p=p->link;
       }
       if(z==0)
       {
           cout<<"\n RECORD IS NOT FOUND:";
       }
   }


  void linklist::insert(student n)
  {
       node*q=new node;
       q->info=n;
       q->link=NULL;
       if(start==NULL)
       {
        start=q;
       }
       else
       {
        node* p=start;
        while(p->link!=NULL)
        {
              p=p->link;
        }
        p->link=q;
        }
  }

  void linklist::show()
  {
        cleardevice();
        student n;
        node *p=start;
        int a=10,b=30;
        while(p!=NULL)
        {
         n=p->info;
         n.output(a,b);
         b+=30;
         p=p->link;
        }
  }

  void linklist::modify()
  {
       char temp[20];
       cout<<"enter the roll no. whose record u want to modify:->  ";
       gets(temp);
       student n;
       node *p,*q;
       int i=0;
       p=start;
       q=p->link;
       if(start==NULL)
       {    cout<<"\n\n\n   Linked list is empty";
        getch();
        return;
       }
       while(q!=NULL)
       {     n=q->info;
        if(n.compare(temp)==1)
        {    i++;
         cout<<"Privious record is:->  "<<endl;
         n.output(100,80);
         getch();
         cleardevice();
         cout<<"\n\n    Now enter new record:->  ";
         n.input();
         q->info=n;
         cout<<"\n\n\n\n\n\n\n\n\n\n        Record is successfully modify";
         break;
         }
        p=p->link;
        q=q->link;
       }

      if(i==0)
      cout<<"\n\n    NO RECORD FOUND";

  }

  void main()
  {
      int d,m;
      d=DETECT;
      initgraph(&d,&m,"c:/tc");

      student n;
      char choice;
      linklist l;
      l.file2list();
      while(1)
      {
         cleardevice();
         choice=mmenu();
         cleardevice();
         setbkcolor(0);
         settextstyle(0,0,0);
         switch (choice)
         {
          case 1:
          if(n.input()==1)
          {
               l.insert(n);
               l.list2file();
          }
          break;

          case 2:
          l.show();
          break;
          case 3:
          l.search();
          break;
          case 4:
          l.delete1();
          l.list2file();
          break;
          case 5:
          l.modify();
          l.list2file();
          break;
          case 6:
          exit(0);
         }
         getch();
       }
  }







?///////////////////////////////////////////////////////////////////////////////////
//////////////////////////file1////////////////////////////////////////////////////


#include<iostream.h>
#include<conio.h>
#include<stdio.h>
#include<graphics.h>
#include<dos.h>
#include<process.h>
int color;
void arrow(int xx,int yy,int color)
{   setcolor(color);
    int a[]={xx-50,yy+7,xx-40,yy+7,xx-20,yy+20,xx-40,yy+33,xx-50,yy+33,xx-50,yy+26,xx-40,yy+26,xx-27,yy+20,xx-40,yy+14,xx-50,yy+14,xx-50,yy+7};
    drawpoly(11,a);
    setfillstyle(1,color);
    floodfill(xx-40,yy+10,color);
}

void msetfocus(int l,int r,int t,int b,char s[])
{    arrow(l,t,8);
     setcolor(15);
     rectangle(l,t,r,b);
     setfillstyle(1,15);
     floodfill(l+2,t+2,15);
     setcolor(6);
     outtextxy(l+5,t,s);
}

void mlostfocus(int l,int r,int t,int b,char s[])
{    arrow(l,t,7);
     setcolor(7);
     rectangle(l,t,r,b);
     setfillstyle(1,7);
     floodfill(l+2,t+2,7);
     setcolor(6);
     outtextxy(l+5,t,s);
}

void men(char x[][50],int msize,int hl)
{
     int lf,tp,rh,bt;
     lf=175;
     rh=lf+225;
     tp=150;
     bt=tp+40;
     setcolor(5);
     settextstyle(1,HORIZ_DIR,4);
     outtextxy(140,60,x[0]);

     settextstyle(1,HORIZ_DIR,2);
     for(int i=1;i<=msize;i++)
     {   if(i==hl)
     msetfocus(lf,rh,tp,bt,x[i]);
     else
     mlostfocus(lf,rh,tp,bt,x[i]);
     tp+=40;
     bt+=40;
     }
}

void getkey(int &j,int &k,int &l)
{    REGS n,m;
     m.h.ah=0X00;
     int86(22,&m,&n);
     j=n.h.ah;
     k=n.h.al;
     m.h.ah=0X02;
     int86(22,&m,&n);
     l=n.h.al;
}

int mmenu()
{
settextstyle(1,HORIZ_DIR,2);
setbkcolor(7);
int ac,sc,st,z=1;
char mstr[][50]={"STUDEMT'S DATABASE","INSERT NEW RECORD ","SHOW ALL RECORD","SEARCH A RECORD","DELETE A RECORD ","MODIFY A RECORD","EXIT"};
while(1)
{
    men(mstr,6,z);
    getkey(sc,ac,st);
       /*sound(7);
    delay(100);
    nosound();   */
    if(sc==72 && z>=1)
    {
          if(z==1)
          {    z=6;
           continue;
          }
          z--;
    }
    else if(sc==80&& z<=6)
    {
          z++;
          if(z==7)
          z=1;
    }
    else if(sc==1)
    return 0;

    else if(sc==28)
    { return z;
    }
}
getch();
}





//////////////////////////////////////////////////////////////////////////
/////////////////////////file2///////////////////////////////////////////


void setfocus(int,int,int,int,char*);
void lostfocus(int,int,int,int,char*);
void lostfocus1(int,int,int,int,char*);

int showform(char str[][50],int n)
{
cleardevice();
int z;
int cur=0,max=0;
int lf=200,rh=320,tp=20,bt=40;
char s1[2],s2[50];
int s,a,p;

   strcpy(s2,"");
   outtextxy(50,28,"ROLL NO.->");
   outtextxy(50,78,"NAME ->");
   outtextxy(50,128,"FEE ->");
   outtextxy(50,178,"E_MAIL ->");
   setfocus(lf,tp,rh,bt,s2);

   for(int i=0;i<n;i++)
   strcpy(str[i],"");

   while(1)
   {
   getkey(s,a,p);
    z=p&4;
   if(s==1)
   return 0;
   else if(z==4 && s==31 )
   return 1;
//  up arrow key

   else if(s==72)
   {
   if(cur>0)
   {
    lostfocus1(lf,tp,rh,bt,str[cur]);
    lostfocus(lf,tp,rh,bt,str[cur]);
    cur--;
    strcpy(s2,str[cur]);
    tp=tp-50;
    bt=tp+20;
   }
   }
// down arrow key

   else if(s==80)
  {
   if(cur<=max-1)
   {
    lostfocus1(lf,tp,rh,bt,str[cur]);
    lostfocus(lf,tp,rh,bt,str[cur]);
    cur++;
    strcpy(s2,str[cur]);
    tp=tp+50;
    bt=tp+20;
   }
  }

// enter key

   else if(a==13)
   {
   if(strlen(s2)!=0)
   {
   strcpy(str[cur],s2);

    if(max<n-1)
    {
    max++;
    }
   if(cur<=max-1)
   {
   cur++;
   lostfocus(lf,tp,rh,bt,s2);
   if(cur==max&&max<n-1)
   strcpy(s2,"");
   else
   strcpy(s2,str[cur]);

   tp=tp+50;
   bt=tp+20;
   }
   }
   }
   else
   {
     if(a==8)
     {

//code for backspace key
     if(strlen(s2)>0)
     s2[strlen(s2)-1]='\0';
     }
     else
     {
// code for any other alphabet

    s1[0]=a;
    s1[1]='\0';
    strcat(s2,s1);
    }
    }
   setfocus(lf,tp,rh,bt,s2);


  }
}

 // Function to write the string in the text box

void setfocus(int a,int b,int c,int d,char *f)
{
 setcolor(GREEN);
 rectangle(a,b,c,d);
 setfillstyle(SOLID_FILL,BLACK);
 floodfill(a+2,b+2,GREEN);
 setcolor(YELLOW);
 outtextxy(a+3,b+3,f);
}

 // Function to wash the rectangle in black

void lostfocus(int a,int b,int c,int d,char *f)
{
 setcolor(BLACK);
 rectangle(a,b,c,d);
 setfillstyle(SOLID_FILL,BLACK);
 floodfill(a+2,b+2,BLACK);
 setcolor(WHITE);
 outtextxy(a+3,b+3,f);
}

// Function called before lostfocus to wash the rectangle

void lostfocus1(int a,int b,int c,int d,char *f)
{
 setcolor(BLUE);
 rectangle(a,b,c,d);
 setfillstyle(SOLID_FILL,BLACK);
 floodfill(a+2,b+2,BLUE);
 setcolor(WHITE);
 outtextxy(a+3,b+3,f);
}

project of three dimensional calculator working with mouse

#include<iostream.h>
#include<conio.h>
#include<stdio.h>
#include<graphics.h>
#include<dos.h>
#include<string.h>
#include<stdlib.h>
#include<math.h>
#include<process.h>

int aaa=247,bbb=167,l2,status,rep=0,mul=0;
char ch,st2[50],st1[2];
double f1=0,f2=0,d1=0,d2=0,d3=0;
void buttan1(int,int,int,int);
void buttan(int,int,int,int);
void text();
void screen(char);
void scremt();
void main()
{         int d,mm,e,a,b,c,k;
      d=DETECT;
      initgraph(&d,&mm,"c:/tc");
      e=graphresult();

      if(e!=0)
      {
          cout<<"Graphics not inialised";
          getch();
          return;
       }

       setbkcolor(BLUE);
       setcolor(7);
       rectangle(aaa-10,bbb-50,aaa+153,bbb+150);
       setfillstyle(1,7);
       floodfill(aaa,bbb,7);

       setcolor(15);
       int f[]={aaa-15,bbb-55,aaa+158,bbb-55,aaa+153,bbb-50,aaa-10,bbb-50,aaa-10,bbb+150,aaa-15,bbb+155,aaa-15,bbb-55};
       drawpoly(7,f);
       setfillstyle(1,15);
       floodfill(aaa-12,bbb-42,15);

       setcolor(8);
       int h[]={aaa+158,bbb-55,aaa+158,bbb+155,aaa-15,bbb+155,aaa-10,bbb+150,aaa+153,bbb+150,aaa+153,bbb-50,aaa+158,bbb-55};
       drawpoly(7,h);
       setfillstyle(1,8);
       floodfill(aaa+156,bbb-40,8);

       for(int ii=1;ii<17;ii++)
       {
          buttan(aaa,bbb,15,8);
          aaa+=39;
          if(ii%4==0)
          {  bbb+=39;
         aaa=247;
          }
       }
       buttan1(236,75,15,8);
       buttan1(350,75,15,8);
       aaa=247;
       bbb=167;
       text();
       scremt();


    REGS n,m;
    n.x.ax=0;
    int86(0x33,&n,&m);
    k=m.x.ax;
    if(k==0)
    return;
    int aa,bb,t1,t2;
    while(1)
    {  n.x.ax=1;
       int86(0x33,&n,&m);
       n.x.ax=3;
       int86(0x33,&n,&m);
       a=m.x.cx;
       b=m.x.dx;
       c=m.x.bx;
       // FOR EXIT XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
       if(c==1 && a>350 && a<400 && b>75 && b<100)
       {    buttan1(350,75,8,15);
        delay(200);
        cleardevice();
        cleardevice();
        setcolor(RED);
        outtextxy(50,50,"MADE BY:");
        outtextxy(50,80,"UPINDER SINGH DHAMI");
        outtextxy(50,110,"B.TECH (FIFTH SEM)");
        outtextxy(50,140,"ELECTRONICS AND COMM ENGG");
        outtextxy(50,170,"GURU NANAK DEV UNIVERSITY (AMRITSAR)");
        outtextxy(50,200,"DATE: 17\\07\\2008");
        delay(7000);
        return;
       }
       // FOR RECET XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
       if(c==1 && a>236 && a<286 && b>75 && b<100)
       {    rep=0;
        mul=0;
        buttan1(236,75,8,15);
        delay(200);
        buttan1(236,75,15,8);
        strcpy(st2,"");
        screen(' ');
        scremt();
       }

       // FOR  FIRST   ROW XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
       // FOR 7
       if(c==1 && a>aaa && a<(aaa+25) && b>bbb && b<(bbb+25))
       {
      buttan(aaa,bbb,8,15);
      delay(200);
      buttan(aaa,bbb,15,8);
      screen('7');
      mul=0;
      continue;
       }

       // FOR 8
       if(c==1 && a>(aaa+39) && a<(aaa+64) && b>bbb&&b<(bbb+25))
       {
       buttan((aaa+39),bbb,8,15);
       delay(200);
       buttan((aaa+39),bbb,15,8);
       screen('8');
       mul=0;
       continue;
       }

       // FOR 9
       if(c==1 && a>(aaa+78) && a<(aaa+103) && b>bbb&&b<(bbb+25))
       {
       buttan((aaa+78),bbb,8,15);
       delay(200);
       buttan((aaa+78),bbb,15,8);
       screen('9');
       mul=0;
       continue;
       }

       // FOR +
       if(c==1 && a>(aaa+117) && a<(aaa+142) && b>bbb&&b<(bbb+25))
       {   rep++;
       mul++;
       if(mul==2)
       { rep--;
         mul--;
       }
       if(rep==2)
       goto label;
       status=2;
       buttan((aaa+117),bbb,8,15);
       delay(200);
       buttan((aaa+117),bbb,15,8);
       d1=f1;
       strcpy(st2,"");
       scremt();
       continue;
       }

       //FOR SECOND ROW XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
       // FOR 4
       if(c==1 && a>aaa && a<(aaa+25) && b>(bbb+39) && b<(bbb+64))
       {
      buttan(aaa,bbb+39,8,15);
      delay(200);
      buttan(aaa,bbb+39,15,8);
      screen('4');
      mul=0;
      continue;
       }

       //FOR 5
       if(c==1 && a>(aaa+39) && a<(aaa+64) && b>(bbb+39) && b<(bbb+64))
       {
      buttan(aaa+39,bbb+39,8,15);
      delay(200);
      buttan(aaa+39,bbb+39,15,8);
      screen('5');
      mul=0;
      continue;
       }

       //FOR 6
       if(c==1 && a>(aaa+78) && a<(aaa+103) && b>(bbb+39) && b<(bbb+64))
       {
      buttan(aaa+78,bbb+39,8,15);
      delay(200);
      buttan(aaa+78,bbb+39,15,8);
      screen('6');
      mul=0;
      continue;
       }

       //FOR -
       if(c==1 && a>(aaa+117) && a<(aaa+142) && b>(bbb+39) && b<(bbb+64))
       {   rep++;
       mul++;
       if(mul==2)
       { rep--;
         mul--;
       }
       if(rep==2)
       goto label;
      status=3;
      buttan(aaa+117,bbb+39,8,15);
      delay(200);
      buttan(aaa+117,bbb+39,15,8);
      d1=f1;
      strcpy(st2,"");
      scremt();
      continue;
       }

       // FOR THIRD ROW XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
       // FOR 1
       if(c==1 && a>aaa && a<(aaa+25) && b>(bbb+78) && b<(bbb+103))
       {
      buttan(aaa,bbb+78,8,15);
      delay(200);
      buttan(aaa,bbb+78,15,8);
      screen('1');
      mul=0;
      continue;
       }

       //FOR 2
       if(c==1 && a>(aaa+39) && a<(aaa+64) && b>(bbb+78) && b<(bbb+103))
       {
      buttan(aaa+39,bbb+78,8,15);
      delay(200);
      buttan(aaa+39,bbb+78,15,8);
      screen('2');
      mul=0;
      continue;
       }

       //FOR 3
       if(c==1 && a>(aaa+78) && a<(aaa+103) && b>(bbb+78) && b<(bbb+103))
       {
      buttan(aaa+78,bbb+78,8,15);
      delay(200);
      buttan(aaa+78,bbb+78,15,8);
      screen('3');
      mul=0;
      continue;
       }

       //FOR *
       if(c==1 && a>(aaa+117) && a<(aaa+142) && b>(bbb+78) && b<(bbb+103))
       {   rep++;
       mul++;
       if(mul==2)
       { rep--;
         mul--;
       }
       if(rep==2)
       goto label;
      status=1;
      buttan(aaa+117,bbb+78,8,15);
      delay(200);
      buttan(aaa+117,bbb+78,15,8);
      d1=f1;
      strcpy(st2,"");
      scremt();
      continue;
       }

       // FOR FORTH ROW XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
       // FOR 0
       if(c==1 && a>aaa && a<(aaa+25) && b>(bbb+117) && b<(bbb+142))
       {
      buttan(aaa,bbb+117,8,15);
      delay(200);
      buttan(aaa,bbb+117,15,8);
      screen('0');
      mul=0;
      continue;
       }

       // FOR .
       if(c==1 && a>(aaa+39) && a<(aaa+64) && b>(bbb+117) && b<(bbb+142))
       {
      buttan(aaa+39,bbb+117,8,15);
      delay(200);
      buttan(aaa+39,bbb+117,15,8);
      screen('.');
      mul=0;
      continue;
       }

       // FOR =
       if(c==1 && a>(aaa+78) && a<(aaa+103) && b>(bbb+117) && b<(bbb+142))
       {
      buttan(aaa+78,bbb+117,8,15);
      delay(200);
      buttan(aaa+78,bbb+117,15,8);
      label:
      if(status==1)
      {  d2=f1;
         d3=d1*d2;
      }
      if(status==2)
      {  d2=f1;
         d3=d1+d2;
      }
      if(status==3)
      {  d2=f1;
         d3=d1-d2;
      }
      if(status==4)
      {  d2=f1;
         d3=d1/d2;
      }
      char temp[50];
      int sig = 10;

      gcvt(d3, sig, temp);
      strcpy(st2,"");
      strcpy(st2,temp);
      scremt();
      screen(' ');
      rep=0;
      mul=0;
      continue;
       }

       // FOR %
       if(c==1 && a>(aaa+117) && a<(aaa+142) && b>(bbb+117) && b<(bbb+142))
       {   rep++;
       mul++;
       if(mul==2)
       { rep--;
         mul--;
       }
       if(rep==2)
       goto label;
      status=4;
      buttan(aaa+117,bbb+117,8,15);
      delay(200);
      buttan(aaa+117,bbb+117,15,8);
      d1=f1;
      strcpy(st2,"");
      scremt();
      continue;
       }

    }
 getch();
closegraph();
}

       void buttan(int x, int y,int ltcolor,int rtcolor)
       {

           setcolor(7);
           rectangle(x,y,x+25,y+25);
           setfillstyle(1,7);
           floodfill(x+2,y+2,7);

           setcolor(ltcolor);
           int a[]={ x-2,y-2,x+27,y-2,x+25,y,x,y,x,y+25,x-2,y+27,x-2,y-2};
           drawpoly(7,a);
           setfillstyle(1,ltcolor);
           floodfill(x-1,y+5,ltcolor);

           setcolor(rtcolor);
           int b[]={x+27,y-2,x+27,y+27,x-2,y+27,x,y+25,x+25,y+25,x+25,y,x+27,y-2 };
           drawpoly(7,b);
           setfillstyle(1,rtcolor);
           floodfill(x+26,y+5,rtcolor);
        }
        void text()
        {  setcolor(4);
           outtextxy(aaa+9,bbb+10,"7");
           outtextxy(aaa+48,bbb+10,"8");
           outtextxy(aaa+87,bbb+10,"9");
           outtextxy(aaa+126,bbb+10,"+");
           outtextxy(aaa+9,bbb+49,"4");
           outtextxy(aaa+48,bbb+49,"5");
           outtextxy(aaa+87,bbb+49,"6");
           outtextxy(aaa+126,bbb+49,"-");
           outtextxy(aaa+9,bbb+88,"1");
           outtextxy(aaa+48,bbb+88,"2");
           outtextxy(aaa+87,bbb+88,"3");
           outtextxy(aaa+126,bbb+88,"*");
           outtextxy(aaa+9,bbb+127,"0");
           outtextxy(aaa+48,bbb+124,".");
           outtextxy(aaa+87,bbb+127,"=");
           outtextxy(aaa+126,bbb+127,"%");
           outtextxy(243,85,"RESET");
           outtextxy(361,85,"EXIT");
           settextstyle(7,HORIZ_DIR,1);
           outtextxy(aaa+50,bbb+250,"MADE BY: UPINDER SINGH DHAMI");

           settextstyle(0,0,1);
        }
        void screen(char ch)
        {  setcolor(15);
           rectangle(aaa-5,bbb-40,aaa+148,bbb-10);
           setfillstyle(1,15);
           floodfill(aaa,bbb-20,15);
       //    outtextxy(aaa+140,bbb,"0.");
           scremt();
           if(ch!='a')
           {
           setcolor(1);
           st1[0]=ch;
           st1[1]='\0';
           strcat(st2,st1);
           }
           l2=strlen(st2);
           if(l2>19)
           {        scremt();
            setcolor(BLUE);
            outtextxy(250,136," data overflow");
            return;
           }
           f1 = atof(st2);
           outtextxy(395-(l2*8),136,st2);

        }
        void scremt()
        {  setcolor(14);
           rectangle(aaa-5,bbb-40,aaa+148,bbb-10);
           setfillstyle(1,14);
           floodfill(aaa,bbb-20,14);
        }

        void buttan1(int x, int y,int ltcolor,int rtcolor)
        {

           setcolor(7);
           rectangle(x,y,x+50,y+25);
           setfillstyle(1,7);
           floodfill(x+2,y+2,7);

           setcolor(ltcolor);
           int a[]={ x-4,y-4,x+54,y-4,x+50,y,x,y,x,y+25,x-4,y+29,x-4,y-4};
           drawpoly(7,a);
           setfillstyle(1,ltcolor);
           floodfill(x-3,y-3,ltcolor);

           setcolor(rtcolor);
           int b[]={x+54,y-4,x+54,y+29,x-4,y+29,x,y+25,x+50,y+25,x+50,y,x+54,y-4};
           drawpoly(7,b);
           setfillstyle(1,rtcolor);
           floodfill(x+52,y+10,rtcolor);

           setcolor(1);

        }