c++定义一个有理数类,重载比较运算符进行数据成员的设置和输出

以下是一个简单的有理数类的定义，其中重载了比较运算符。

#include <iostream>
using namespace std;

class Rational {
public:
    Rational(int n = 0, int d = 1) : numerator(n), denominator(d) {}

    bool operator==(const Rational& other) const {
        return numerator == other.numerator && denominator == other.denominator;
    }

    bool operator<(const Rational& other) const {
        return numerator * other.denominator < other.numerator * denominator;
    }

    bool operator>(const Rational& other) const {
        return numerator * other.denominator > other.numerator * denominator;
    }

    friend ostream& operator<<(ostream& os, const Rational& r) {
        os << r.numerator << "/" << r.denominator;
        return os;
    }

private:
    int numerator;
    int denominator;
};

int main() {
    Rational r1(2, 3);
    Rational r2(4, 5);

    cout << "r1 = " << r1 << endl;
    cout << "r2 = " << r2 << endl;

    if (r1 == r2) {
        cout << "r1 and r2 are equal" << endl;
    } else if (r1 < r2) {
        cout << "r1 is less than r2" << endl;
    } else {
        cout << "r1 is greater than r2" << endl;
    }

    return 0;
}

输出：

r1 = 2/3
r2 = 4/5
r1 is less than r2