c++实现复数的加减乘除

C++ 中可以使用结构体来实现复数的加减乘除。下面是一个简单的实现代码：

#include <iostream>
using namespace std;

struct Complex {
    double real; // 实部
    double imag; // 虚部
};

// 复数加法
Complex add(Complex a, Complex b) {
    Complex res;
    res.real = a.real + b.real;
    res.imag = a.imag + b.imag;
    return res;
}

// 复数减法
Complex subtract(Complex a, Complex b) {
    Complex res;
    res.real = a.real - b.real;
    res.imag = a.imag - b.imag;
    return res;
}

// 复数乘法
Complex multiply(Complex a, Complex b) {
    Complex res;
    res.real = a.real * b.real - a.imag * b.imag;
    res.imag = a.real * b.imag + a.imag * b.real;
    return res;
}

// 复数除法
Complex divide(Complex a, Complex b) {
    Complex res;
    double denominator = b.real * b.real + b.imag * b.imag;
    res.real = (a.real * b.real + a.imag * b.imag) / denominator;
    res.imag = (a.imag * b.real - a.real * b.imag) / denominator;
    return res;
}

int main() {
    Complex a = {1, 2};
    Complex b = {3, 4};

    Complex res_add = add(a, b);
    Complex res_subtract = subtract(a, b);
    Complex res_multiply = multiply(a, b);
    Complex res_divide = divide(a, b);

    cout << "a + b = " << res_add.real << " + " << res_add.imag << "i" << endl;
    cout << "a - b = " << res_subtract.real << " + " << res_subtract.imag << "i" << endl;
    cout << "a * b = " << res_multiply.real << " + " << res_multiply.imag << "i" << endl;
    cout << "a / b = " << res_divide.real << " + " << res_divide.imag << "i" << endl;

    return 0;
}

以上代码中，使用结构体 `Complex` 来表示复数，包括实部 `real` 和虚部 `imag` 两个属性。然后分别实现了复数加法、减法、乘法、除法四个函数。最后在 `main()` 函数中调用这些函数进行测试，并输出结果。