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// 1. 2. 创建一个名为 Circle 的类，具有成员变量 radius 和 pi（圆周率），以及成员函数 double calculateArea() ，用于计算圆的面积。
#include <iostream>
using namespace std;
class Circle
{
public:
double radius, pi = 3.1415926;
double calculateArea()
return pi * radius * radius;
}
};
int main()
return 0;