C 练习实例57

#include "graphics.h"
int main()
{
    int driver,mode,i;
    float x0,y0,y1,x1;
    float j=12,k;
    driver=VGA;mode=VGAHI;
    initgraph(&driver,&mode,"");
    setbkcolor(GREEN);
    x0=263;y0=263;y1=275;x1=275;
    for(i=0;i<=18;i++)
    {
        setcolor(5);
        line(x0,y0,x0,y1);
        x0=x0-5;
        y0=y0-5;   
        x1=x1+5;   
        y1=y1+5;   
        j=j+10;
    }
}