1.3编程基础之算术表达式与顺序执行 09 与圆相关的计算

 http://noi.openjudge.cn/ch0103/09/

#include<iostream>
using namespace std;
int main()
{
	double d,c,s,r,pi;
	pi=3.14159;
	
	cin>>r;
	
	d=2*r;
	c=2*3.14159*r;
	s=3.14159*r*r;
	
	printf("%.4f %.4f %.4f\n",d,c,s);	
	
	return 0;
}

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