头文件graphics.h包含circle()函数，该函数绘制一个以(x，y)为中心且给定半径的圆。
句法 ：
circle(x, y, radius);
where,
(x, y) is center of the circle.
'radius' is the Radius of the circle.
例子 ：
输入：x = 250，y = 200，半径= 50输出： 
输入：x = 300，y = 150，半径= 90输出： 
下面是在C中画圆的实现：
// C Implementation for drawing circle
#include
//driver code
int main()
{
// gm is Graphics mode which is
// a computer display mode that
// generates image using pixels.
// DETECT is a macro defined in
// "graphics.h" header file
int gd = DETECT, gm;
// initgraph initializes the
// graphics system by loading a
// graphics driver from disk
initgraph(&gd, &gm, "");
// circle function
circle(250, 200, 50);
getch();
// closegraph function closes the
// graphics mode and deallocates
// all memory allocated by
// graphics system .
closegraph();
return 0;
}
输出 ：
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