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

下面是一个简单的C++代码示例：

#include <iostream>
using namespace std;

class Rational {
private:
    int numerator;   // 分子
    int denominator; // 分母

public:
    // 构造函数
    Rational(int n = 0, int d = 1) : numerator(n), denominator(d) {}

    // 重载比较运算符
    bool operator==(const Rational& rhs) const {
        return numerator == rhs.numerator && denominator == rhs.denominator;
    }

    bool operator!=(const Rational& rhs) const {
        return !(*this == rhs);
    }

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

    bool operator<=(const Rational& rhs) const {
        return *this < rhs || *this == rhs;
    }

    bool operator>(const Rational& rhs) const {
        return !(*this <= rhs);
    }

    bool operator>=(const Rational& rhs) const {
        return !(*this < rhs);
    }

    // 设置分子和分母
    void set(int n, int d) {
        numerator = n;
        denominator = d;
    }

    // 输出有理数
    void print() const {
        cout << numerator << "/" << denominator << endl;
    }
};

int main() {
    Rational a(1, 2), b(2, 3), c(1, 2);

    if (a == c) {
        cout << "a == c" << endl;
    }

    if (a != b) {
        cout << "a != b" << endl;
    }

    if (a < b) {
        cout << "a < b" << endl;
    }

    if (a <= c) {
        cout << "a <= c" << endl;
    }

    if (b > a) {
        cout << "b > a" << endl;
    }

    if (c >= a) {
        cout << "c >= a" << endl;
    }

    return 0;
}

该代码定义了一个有理数类`Rational`，包含分子和分母两个私有成员变量，以及构造函数、重载比较运算符、设置分子和分母、输出有理数等公有成员函数。在`main`函数中，我们对这些运算符进行了测试和输出。