Write a program to draw circle using Bresenham’s algorithm.

``` #include #include #include #include #include #include void main() { int x1,y1,x,y,r,p,gdriver=DETECT,gmode,errorcode; initgraph(&gdriver,&gmode,"c:\\tc\\bgi"); errorcode=graphresult(); if(errorcode!=grOk) { cout << "graphics error is: %s" << grapherrormsg(errorcode); cout << "hit a key to halt" ; getch(); exit(1); } cleardevice(); cout << "enter the value of x1,y1,r" << endl; cin >>x1>>y1>>r; x=0; y=r; p=3 - 2 * r; while(x<=y) { putpixel(x1+x,y1+y,2); putpixel(x1-x,y1+y,2); putpixel(x1+x,y1-y,2); putpixel(x1-x,y1-y,2); putpixel(x1+y,y1+x,2); putpixel(x1-y,y1+x,2); putpixel(x1+y,y1-x,2); putpixel(x1-y,y1-x,2); if(p<0) p+=4* x++ +6; else p+=4* (x++-y--) +10; } getch(); } ``` </div>