... a,b,d; putpixel(x,y,15); d= 3-2 *R; for(a=0,b=R;a<=b;a++){putpixel(x+a,y+b,mau);putpixel(x-a,y+b,mau);putpixel(x+a,y-b,mau);putpixel(x-a,y-b,mau);putpixel(x+b,y+a,mau);putpixel(x-b,y+a,mau);putpixel(x-b,y-a,mau);putpixel(x+b,y-a,mau);if(d<0) ... = 1 - R; c=getcolor(); x= 0;y=R; while(x<=y){ putpixel(x+x0,y+y0,c); putpixel(-x+x0,y+y0,c); putpixel(x+x0,-y+y0,c); putpixel(-x+x0,-y+y0,c); putpixel(y+x0,x+y0,c); putpixel(y+x0,-x+y0,c); ... putpixel(y+x0,-x+y0,c); putpixel(-y+x0,x+y0,c); putpixel(-y+x0,-x+y0,c); if(p<0) p+=2*x + 3; else { p+=2*(x-y)+5;y ;} x++; } } void totron(int xc, int yc, int R, int c){ for (int i=xc-R;...