用c++写出复数的计算

可以使用结构体来表示复数，例如：

typedef struct {
    double real;  // 实部
    double imag;  // 虚部
} complex;

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

// 复数减法
complex sub(complex a, complex b) {
    complex c;
    c.real = a.real - b.real;
    c.imag = a.imag - b.imag;
    return c;
}

// 复数乘法
complex mul(complex a, complex b) {
    complex c;
    c.real = a.real * b.real - a.imag * b.imag;
    c.imag = a.real * b.imag + a.imag * b.real;
    return c;
}

// 复数除法
complex div(complex a, complex b) {
    complex c;
    double d = b.real * b.real + b.imag * b.imag;
    c.real = (a.real * b.real + a.imag * b.imag) / d;
    c.imag = (a.imag * b.real - a.real * b.imag) / d;
    return c;
}

使用时，可以先定义两个复数：

complex a = {1., 2.};  // 1+2i
complex b = {3., 4.};  // 3+4i

然后进行计算：

complex c = add(a, b);  // c = a + b = 4+6i
complex d = sub(a, b);  // d = a - b = -2-2i
complex e = mul(a, b);  // e = a * b = -5+10i
complex f = div(a, b);  // f = a / b = .44+.08i