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我就是吴小鸡

#include<iostream>
using namespace std;
int main()
{
	float r,s,c;
	cout<<"请输入半径：";
	cin>>r;
	const float PI = 3.14;
	s = PI*r*r;
	c = 2*PI*r;
	cout<<"周长："<<c<<endl<<"面积："<<s;
	return 0 ;
} 

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