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// 1. 2. 创建一个名为 Rectangle 的类，具有成员变量 width 和 height，以及成员函数 double calculateArea() ，用于计算矩形的面积。
#include <iostream>
using namespace std;
class Rectangle
{
public:
double calculateArea()
return width * height;
}
int width, height;
};
int main()
return 0;