9-2.c

《C程序员成长攻略》-黎陡-源代码,书中所有源码

/*错误的程序：求两个圆的圆心之间的距离*/

#include"stdio.h"
#include"graphics.h"

main()
{
	int gd=DETECT,gm;
	int i,x1,x2,y1,y2;
	float d;
	char key;
	initgraph(&gd,&gm,"c:\tc\tc");
	setbkcolor(BLACK);
	x1=100;y1=50;
	x2=500;y2=350;
	for(i=0;i<300;i++)
	{  /*一个圆从上到下运动，另一个圆从下到上运动*/     
		setcolor(WHITE);
		circle(x1,y1,20);
		circle(x2,y2,20);
		delay(30000);
		if(kbhit())
		{
			if((key=getch())==13)
				break;
		}
		setcolor(BLACK);
		circle(x1,y1,20);
		circle(x2,y2,20);
		delay(30000);
		y1++;
		y2--;
	}
	d=sqrt((x1-x2)*(x1-x2)+(y1-y2)*(y1-y2));
	printf("   The distance of two circles is %6.1f",d);
	getch();
}