program which define the pixel of the cursor while moving on the screen

#include<iostream.h>
#include<conio.h>
#include<dos.h>
int a,b,c,k;
void main()
{   clrscr();
    REGS n,m;
    n.x.ax=0;
    int86(0x33,&n,&m);
    k=m.x.ax;
    if(k==0)
    return;
    while(!kbhit())
    {  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;
       gotoxy(10,20);
       cout<<a<<","<<b<<","<<c;
    }
    getch();
 }