if(y1<=TOP||y1>=BOTTOM)

#include "graphics.h"
#define LEFT 0
#define TOP 0
#define RIGHT 639
#define BOTTOM 479
#define LINES 400
#define MAXCOLOR 15
main()

{

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int driver,mode,error;
int x1,y1;
int x2,y2;
int dx1,dy1,dx2,dy2,i=1;
int count=0;
int color=0;
driver=VGA;
mode=VGAHI;
initgraph(&driver,&mode,"");
x1=x2=y1=y2=10;
dx1=dy1=2;
dx2=dy2=3;
while(!kbhit())
{
　 line(x1,y1,x2,y2);
　 x1+=dx1;y1+=dy1;
　 x2+=dx2;y2+dy2;
　 if(x1<=LEFT||x1>=RIGHT)
　 dx1=-dx1;
　 if(y1<=TOP||y1>=BOTTOM)
　　 dy1=-dy1;
　 if(x2<=LEFT||x2>=RIGHT)
　　 dx2=-dx2;
　 if(y2<=TOP||y2>=BOTTOM)
　　 dy2=-dy2;
　 if(++count>LINES)
　 {
　　 setcolor(color);
　　 color=(color>=MAXCOLOR)?0:++color;
　 }
}
closegraph();
}