Hardware lab program for Mouse co-ordinates as well as status

This is a C program to implement mouse co-ordinates as well as status of button click in the hardware lab.

If you have any doubts, please let me know.

#include<stdio.h>

#include<conio.h>

#include<dos.h>

void main()

{

     int x,y , z,x1,y1,z1;

     union REGS in,out;

     in.x.ax=1;

     int86(0x33,&in,&out);

     in.x.ax=3;

     int86(0x33,&in,&out);

     x1=out.x.cx;

     y1=out.x.dx;

     z1=out.x.bx;

    do

    {

        do

        {

              in.x.ax=1;

              int86(0x33,&in,&out);

              in.x.ax=3;

              int86(0x33,&in,&out);

              x=out.x.cx;

              y=out.x.dx;

              z=out.x.bx;

        }while((x==x1)&&(y==y1)&&(z==z1));

            clrscr();

            printf("MOUSE COORDINATES:");

            printf("\nx coordinate:%d\t ",x1);

            printf("\ny coordinate:%d\t ",y1);

            printf("\n\nBUTTON STATUS");

            switch(z1)

            {

                 case 0: printf("\nNo press\n");

                        break;

                 case 1:printf("\nLeft press\n");

                        break;

                 case 2:printf("\nRight press\n");

                        break;

                 case 3:printf("\nBoth press\n");

                break;

         }

         x1=x;

         y1=y;

             z1=z;

             printf("\n\nPress any key to exit..");

     }while(!kbhit());

     in.x.ax=2;

     int86(0x33,&in,&out);

}