函数作用:画圆

头文件:graphics.h

原形:void far circle(int x, int y, int radius)

参数:x,y为圆心坐标,RADIUS为半径

例:

#include <graphics.h>

#include <stdlib.h>

#include <stdio.h>

#include <conio.h>

int main(void)

{

int gdriver = DETECT, gmode, errorcode;

int midx, midy;

int radius = 100;

initgraph(&gdriver, &gmode, );

errorcode = graphresult();

if (errorcode != grOk)

{

printf("Graphics error: %s

", grapherrormsg(errorcode));

printf("Press any key to halt:");

getch();

exit(1);

}

midx = getmaxx() / 2;

midy = getmaxy() / 2;

setcolor(getmaxcolor());

circle(midx, midy, radius);

getch();

closegraph();

return 0;

}