Mouse programming in c

(1) Write a c program which restricts the movement of pointer?
Answer:

//restrict the x and y coordinate

#include <dos.h>

#include <stdio.h>

void main()

{

union REGS i,o;

//show mouse pointer

i.x.ax=1;

int86(0x33,&i,&o);

//x coordinate restriction

i.x.ax=7;

i.x.cx=20;

i.x.dx=300;

int86(0x33,&i,&o);

//y coordinate restriction

i.x.ax=8;

i.x.cx=50;

i.x.dx=250;

int86(0x33,&i,&o);

getch();

}

(2) Write c program which display position of pointer in (x coordinate, y coordinate)?

Answer:

#include<dos.h>

#include<stdio.h>

void main()

{

union REGS i,o;

int x,y,k;

//show mouse pointer

i.x.ax=1;

int86(0x33,&i,&o);

while(!kbhit())  //its value will false when we hit key in the key board

{

i.x.ax=3;    //get mouse position

x=o.x.cx;

y=o.x.dx;

clrscr();

printf("(%d , %d)",x,y);

delay(250);

int86(0x33,&i,&o);

}

getch();

}