program to enter the values of data of form in boxex and by pressing enter cursor goes to second box

#include<iostream.h>
#include<conio.h>
#include<graphics.h>
#include<dos.h>
#include<string.h>

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

void main()
{
   clrscr();
// Array of String

   char str[3][50];

// max will give how many strings have been enterd in the array and
// cur will give the current position in the array of string
   int cur=0,max=0;

// parameters of rectangle

   int lf=200,rh=320,tp=20,bt=40;


//s2 will have the string being enterd by the user

   char s1[2],s2[50];
   int s,a,p;

//  Graphics Initialisation

   int d,m;
   d=DETECT;
   initgraph(&d,&m,"c:\\tc");
   outtextxy(50,28,"ROLL NO.->");
   outtextxy(50,78,"NAME ->");
   outtextxy(50,128,"FEE ->");
   outtextxy(50,178,"E_MAIL ->");
   strcpy(s2,"");
   setfocus(lf,tp,rh,bt,s2);

// COpying empty string in array of string to avoid garbage values

   for(int i=0;i<3;i++)
   strcpy(str[i],"");

   while(1)
   {
   getkey(s,a,p);

//press esc key to break

   if(s==1)
   break;
//  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)
    {
         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<2)
         {
             max++;
         }
         if(cur<max)
         {
             cur++;
             lostfocus(lf,tp,rh,bt,s2);
             if(cur==max&&max<2)
             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);


  }         //while loop closed

   getch();
   closegraph();
}

void getkey(int &sc,int &ac,int &sp)
{
    REGS ix,ox;
    ix.h.ah=0x00;
    int86(0x16,&ix,&ox);
    sc=ox.h.ah;
    ac=ox.h.al;

    ix.h.ah=0x02;
    int86(0x16,&ix,&ox);
    sp=ox.h.al;
}

 // 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);
}