C++中立方运算，用到重载与输出流

可以通过重载运算符和输出流来实现C++中立方运算。下面是一段示例代码：

#include <iostream>
using namespace std;

class Cube {
public:
    double length;

    Cube() {
        length = 0;
    }

    Cube(double len) {
        length = len;
    }

    Cube operator+(const Cube& c) {
        Cube cube;
        cube.length = this->length + c.length;
        return cube;
    }

    Cube operator-(const Cube& c) {
        Cube cube;
        cube.length = this->length - c.length;
        return cube;
    }

    Cube operator*(const Cube& c) {
        Cube cube;
        cube.length = this->length * c.length;
        return cube;
    }

    Cube operator/(const Cube& c) {
        Cube cube;
        cube.length = this->length / c.length;
        return cube;
    }

    Cube operator^(const int n) {
        Cube cube;
        cube.length = pow(this->length, n);
        return cube;
    }

    friend ostream& operator<<(ostream& os, const Cube& c) {
        os << "Length: " << c.length << endl;
        return os;
    }
};

int main() {
    Cube c1(3);
    Cube c2(2);

    Cube c3 = c1 + c2;
    cout << c3;

    Cube c4 = c1 - c2;
    cout << c4;

    Cube c5 = c1 * c2;
    cout << c5;

    Cube c6 = c1 / c2;
    cout << c6;

    Cube c7 = c1 ^ 3;
    cout << c7;

    return 0;
}

在这个示例中，Cube类表示一个立方体，其中重载了加、减、乘、除、幂运算符，以实现立方运算。此外，还重载了输出流运算符，以便在输出时可以直接打印对象的属性。在主函数中，创建了两个Cube对象，然后进行了各种运算，并将结果输出到控制台。