用结构体实现复数的加减乘除

可以使用结构体来实现复数的加减乘除。例如：

typedef struct {
double real;
double imag;
} Complex;

Complex add(Complex a, Complex b) {
Complex c;
c.real = a.real + b.real;
c.imag = a.imag + b.imag;
return c;
}

Complex sub(Complex a, Complex b) {
Complex c;
c.real = a.real - b.real;
c.imag = a.imag - b.imag;
return c;
}

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;
}

Complex div(Complex a, Complex b) {
Complex c;
double denominator = b.real * b.real + b.imag * b.imag;
c.real = (a.real * b.real + a.imag * b.imag) / denominator;
c.imag = (a.imag * b.real - a.real * b.imag) / denominator;
return c;
}

这样就可以通过调用 add、sub、mul、div 函数来实现复数的加减乘除了。