1014：与圆相关的计算

louyuxiang

[C++] 纯文本查看 复制代码

#include<stdio.h>
using namespace std;
int main(){
	float r,d,c,s;
	scanf("%f",&r);
	d=r*2;
	c=d*3.14159;
	s=3.14159*r*r;
	printf("%0.4lf %0.4lf %0.4lf",d,c,s);
}