计算圆周长与面积
// File: circle.cpp// 该程序用于计算圆面积和周长
#include <iostream>
using namespace std;
int main() {
// 定义常量 PI
const double PI = 3.14159;
double radius, area, circum;
cout << "请输入圆的半径：";
cin >> radius;
area = PI * radius * radius;
circum = 2 * PI * radius;
cout << endl;
cout << "圆的面积为：" << area << endl;
cout << "圆的周长为：" << circum << endl;
return 0;
}
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