C语言怎么进行重载运算符

四则运算符（+、-、*、/、+=、-=、*=、/=）和关系运算符（>、=、==、!=）都是数学运算符，它们在实际开发中非常常见，被重载的几率也很高，并且有着相似的重载格式。本节以复数类 Complex 为例对它们进行重载，重在演示运算符重载的语法以及规范。

复数能够进行完整的四则运算，但不能进行完整的关系运算：我们只能判断两个复数是否相等，但不能比较它们的大小，所以不能对 >、= 进行重载。下面是具体的代码：

#include 
#include 
using namespace std;

//复数类
class Complex{
public:  //构造函数
    Complex(double real = 0.0, double imag = 0.0): m_real(real), m_imag(imag){ }
public:  //运算符重载
    //以全局函数的形式重载
    friend Complex operator+(const Complex &c1, const Complex &c2);
    friend Complex operator-(const Complex &c1, const Complex &c2);
    friend Complex operator*(const Complex &c1, const Complex &c2);
    friend Complex operator/(const Complex &c1, const Complex &c2);
    friend bool operator==(const Complex &c1, const Complex &c2);
    friend bool operator!=(const Complex &c1, const Complex &c2);
    //以成员函数的形式重载
    Complex & operator+=(const Complex &c);
    Complex & operator-=(const Complex &c);
    Complex & operator*=(const Complex &c);
    Complex & operator/=(const Complex &c);
public:  //成员函数
    double real() const{ return m_real; }
    double imag() const{ return m_imag; }
private:
    double m_real;  //实部
    double m_imag;  //虚部
};

//重载+运算符
Complex operator+(const Complex &c1, const Complex &c2){
    Complex c;
    c.m_real = c1.m_real + c2.m_real;
    c.m_imag = c1.m_imag + c2.m_imag;
    return c;
}
//重载-运算符
Complex operator-(const Complex &c1, const Complex &c2){
    Complex c;
    c.m_real = c1.m_real - c2.m_real;
    c.m_imag = c1.m_imag - c2.m_imag;
    return c;
}
//重载*运算符  (a+bi) * (c+di) = (ac-bd) + (bc+ad)i
Complex operator*(const Complex &c1, const Complex &c2){
    Complex c;
    c.m_real = c1.m_real * c2.m_real - c1.m_imag * c2.m_imag;
    c.m_imag = c1.m_imag * c2.m_real + c1.m_real * c2.m_imag;
    return c;
}
//重载/运算符  (a+bi) / (c+di) = [(ac+bd) / (c²+d²)] + [(bc-ad) / (c²+d²)]i
Complex operator/(const Complex &c1, const Complex &c2){
    Complex c;
    c.m_real = (c1.m_real*c2.m_real + c1.m_imag*c2.m_imag) / (pow(c2.m_real, 2) + pow(c2.m_imag, 2));
    c.m_imag = (c1.m_imag*c2.m_real - c1.m_real*c2.m_imag) / (pow(c2.m_real, 2) + pow(c2.m_imag, 2));
    return c;
}
//重载==运算符
bool operator==(const Complex &c1, const Complex &c2){
    if( c1.m_real == c2.m_real && c1.m_imag == c2.m_imag ){
        return true;
    }else{
        return false;
    }
}
//重载!=运算符
bool operator!=(const Complex &c1, const Complex &c2){
    if( c1.m_real != c2.m_real || c1.m_imag != c2.m_imag ){
        return true;
    }else{
        return false;
    }
}

//重载+=运算符
Complex & Complex::operator+=(const Complex &c){
    this->m_real += c.m_real;
    this->m_imag += c.m_imag;
    return *this;
}
//重载-=运算符
Complex & Complex::operator-=(const Complex &c){
    this->m_real -= c.m_real;
    this->m_imag -= c.m_imag;
    return *this;
}
//重载*=运算符
Complex & Complex::operator*=(const Complex &c){
    this->m_real = this->m_real * c.m_real - this->m_imag * c.m_imag;
    this->m_imag = this->m_imag * c.m_real + this->m_real * c.m_imag;
    return *this;
}
//重载/=运算符
Complex & Complex::operator/=(const Complex &c){
    this->m_real = (this->m_real*c.m_real + this->m_imag*c.m_imag) / (pow(c.m_real, 2) + pow(c.m_imag, 2));
    this->m_imag = (this->m_imag*c.m_real - this->m_real*c.m_imag) / (pow(c.m_real, 2) + pow(c.m_imag, 2));
    return *this;
}

int main(){
    Complex c1(25, 35);
    Complex c2(10, 20);
    Complex c3(1, 2);
    Complex c4(4, 9);
    Complex c5(34, 6);
    Complex c6(80, 90);
   
    Complex c7 = c1 + c2;
    Complex c8 = c1 - c2;
    Complex c9 = c1 * c2;
    Complex c10 = c1 / c2;
    cout
运行结果：

c7 = 35 + 55i

c8 = 15 + 15i

c9 = -450 + 850i

c10 = 1.9 + -0.3i

c3 = 26 + 37i

c4 = -6 + -11i

c5 = 220 + 4460i

c6 = 5.2 + 1.592i

c1 != c2


需要注意的是，我们以全局函数的形式重载了 +、-、*、/、==、!=，以成员函数的形式重载了 +=、-=、*=、/=，而且应该坚持这样做，不能一股脑都写作成员函数或者全局函数，具体原因我们将在下节《到底以成员函数还是全局函数（友元函数）的形式重载运算符》讲解。

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