#include<stdio.h>

 #include<string.h>

 #include<stdlib.h>

 #include<graphics.h>

 #include<conio.h>

 #include<math.h>

 #include<dos.h>

 int init;

 int read_mouse;

 void cursor;

 void newxy;

 int main()

 {

     int buttons,x,y;

     char str[];

     int driver=VCA;

     int moede=VGAHT;

     initgraph(&gdriver,&mode,"");

     cleardevice();

     rectangle(,,,);

     setfillstyle(,);

     circle(,,);

     x=,y=;

     cursor(x,y);

     for(;;)

     {

         newxy(&x,&y,&butttons);

         if(x>=&&x<=&&y>=&&y<=&&buttons)

         {

             cleardevice();

             closegraph();

             exit();

         }

     }

 }

 void(int x,int y)

 {

     int x1,x2,y1,y2;

     x1=x-;

     x2=x+;

     y1=y-;

     y2=y+;

     line(x1,y,x2,y);

     line(x,y1,x,y2);

 }

 int read_mouse(int*mx,int*my,int*mbutton)

 {

     union REGS regs;

     int x0=*mx,y0=*my,button0=*mbutton;

     int xnew,ynew;

     do

     {

         regs.x.ax=;

         int86(0x33,&regs,&regs);

         xnew=regs.x.cx;

         ynew=regs.x.dx;

         *mbutton=regs.x.bx;

     }

     while(xnew==x0&&ynew==y0&&*mbutton==button0);

     *mx=xnew;

     *my=ynew;

     switch(*mbutton)

     {

     case :

         return ;

     case :

         return ;

     case :

         return ;

     case :

         return3;

     default :

         return4;

     }

 }

 void newxy(int *mx,int *my,int *mbutt)

 {

   int ch,xx0=*mx,yy0=*my;

   int xm,ym;

   ch=read_mouse(&xm,&ym,mbutt);

   curse(xx0,yy0);

   curse(xm,xy);

   switch(ch)

   {

       case : break;

       case : cirse(xm,ym,);break;

       case : rectangle(xm-,ym-,xm+,ym+);break;

       default : putpixel(xm,ym,);break;

   }

     *mx=xm;

     *my=ym;

 }