117笔记问答在C++中，std::complex是一个模板类，用于表示复数。它已经为你提供了一系列运算符重载，例如+、-、*和/，以及相等和不等运算符。然而，如果你想要自定义一个复数类并实现这些运算符重载，以下是一个简单的示例：
#include class Complex { public: Complex(double real, double imag) : real_(real), imag_(imag) {} // Getters double real() const { return real_; } double imag() const { return imag_; } // Operator overloads Complex operator+(const Complex& other) const { return Complex(real_ + other.real_, imag_ + other.imag_); } Complex operator-(const Complex& other) const { return Complex(real_ - other.real_, imag_ - other.imag_); } Complex operator*(const Complex& other) const { double real_part = real_ * other.real_ - imag_ * other.imag_; double imag_part = real_ * other.imag_ + imag_ * other.real_; return Complex(real_part, imag_part); } Complex operator/(const Complex& other) const { double denominator = other.real_ * other.real_ + other.imag_ * other.imag_; double real_part = (real_ * other.real_ + imag_ * other.imag_) / denominator; double imag_part = (imag_ * other.real_ - real_ * other.imag_) / denominator; return Complex(real_part, imag_part); } bool operator==(const Complex& other) const { return real_ == other.real_ && imag_ == other.imag_; } bool operator!=(const Complex& other) const { return !(*this == other); } private: double real_; double imag_; }; int main() { Complex a(3, 4); Complex b(1, 2); Complex c = a + b; Complex d = a - b; Complex e = a * b; Complex f = a / b; std::cout << "a + b = (" << c.real() << ", " << c.imag() << ")\n"; std::cout << "a - b = (" << d.real() << ", " << d.imag() << ")\n"; std::cout << "a * b = (" << e.real() << ", " << e.imag() << ")\n"; std::cout << "a / b = (" << f.real() << ", " << f.imag() << ")\n"; return 0; } 这个示例中的Complex类实现了加法、减法、乘法和除法运算符重载。同时还实现了相等和不等运算符重载。注意，这里的运算符重载函数都是const成员函数，因为它们不应该修改对象的状态。