Question

用c语言编一个在屏幕上用×画一个空心的圆的程序

Answer 1

/*调试环境:tc2.0*/
#include <graphics.h>
#include <stdio.h>
#include <math.h>
#include <dos.h>
void move_circle(int x,int y,int r)
{int i,j;
for (i=-r;i<=r;i++)
{j=(int)sqrt(r*r-i*i);
putpixel(x+i,y-j,15);
delay(10000);
putpixel(x+i,y-j,1);}
for (i=r;i>=-r;i--)
{j=(int)sqrt(r*r-i*i);
putpixel(x+i,y+j,15);
delay(10000);
putpixel(x+i,y+j,1);
}
}
main()
{int gdriver=DETECT,gmode;
initgraph(&gdriver,&gmode,"");/*填入TC2.0的所在目录(在""内)，如："c:\\turboc2"*/
setcolor(1);
circle(300,200,100);
move_circle(300,200,100);
getch();
closegraph();
}

参照:http://zhidao.baidu.com/question/2254057.html?si=2