Write a c program to create a paint brush using graphics

#include<stdio.h>
#include<conio.h>
#include<graphics.h>
#include<stdlib.h>
struct BYTEREGS
{
unsigned char al, ah, bl, bh;
unsigned char cl, ch, dl, dh;
};
struct WORDREGS
{
unsigned int ax, bx, cx, dx;
unsigned int si, di, cflag, flags;
};
union REGS
{
struct WORDREGS x;
struct BYTEREGS h;
};
void main()
{
int x,y,b,px,py,c,p,s,cl;
int d=0,m;
union REGS i,o;
initgraph(&d,&m,"D:\\TC\\BGI");
i.x.ax=1;
int86(0x33,&i,&o);
i.x.ax=8;
i.x.cx=20;
i.x.dx=450;
int86(0x33,&i,&o);
printf("Brush style insert number from 0 to 5 : ");
scanf("%d",&p);
printf("Brush size insert number from 1 to 7 : ");
scanf("%d",&s);
printf("Brush color insert number from 1 to 16 : ");
scanf("%d",&cl);
clrscr( );

cleardevice();
printf("\t\t**********DRAW IMAGE************");
while(!kbhit( ))
{
i.x.ax=3;
b=o.x.bx;
x=o.x.cx;
y=o.x.dx;
px=x;
py=y;
int86(0x33,&i,&o);
if(cl==16)
{
c=random(16);
}
else
{
c=cl;
}
setcolor(c);
if(b==1)
{
i.x.ax=3;
int86(0x33,&i,&o);
x=o.x.cx;
y=o.x.dx;
b=o.x.bx;
switch( p )
{
case 1: circle(px,py,s);break;
case 2: ellipse(px,py,0,270,s,s+2);break;
case 3: fillellipse(px,py,s+2,s);break;
case 4: rectangle(px,py,x,y);break;
case 5: sector(px,py,30,120,s,s);break;
default : line(px,py,x,y);
}
}
}
getch();
restorecrtmode();
closegraph();
}