C++运算符重载（一）——加减

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一、运算符重载为成员函数

#include <iostream>using namespace std;class Complex {public:    double real;    double imag;    Complex(double r = 0.0,double i = 0.0);    Complex operator+(const Complex&);    Complex operator-(const Complex&);    void printcomplex();};Complex::Complex(double r ,double i){    real = r;    imag = i;}Complex Complex::operator+(const Complex& c){    return Complex(real+c.real,imag+c.imag);}Complex Complex::operator-(const Complex& c){    return Complex(real-c.real,imag-c.imag);}void Complex::printcomplex(){    cout<<real<<"+"<<imag<<"i"<<endl;}int main(int argc, const char * argv[]) {    Complex a(3,4),b(5,9),c,d;    c = a + b;    d = b - a;    c.printcomplex();    d.printcomplex();    return 0;}

二、运算符重载成为普通函数

#include <iostream>using namespace std;class Complex {public:    double real;    double imag;    Complex(double r = 0.0,double i = 0.0);    void printcomplex();};Complex::Complex(double r ,double i){    real = r;    imag = i;}Complex operator+(const Complex& c1, const Complex& c2){    return Complex(c1.real+c2.real,c1.imag+c2.imag);}Complex operator-(const Complex& c1, const Complex& c2){    return Complex(c1.real-c2.real,c1.imag-c2.imag);}void Complex::printcomplex(){    cout<<real<<"+"<<imag<<"i"<<endl;}int main(int argc, const char * argv[]) {    Complex a(3,4),b(5,9),c,d;    c = a + b;    d = b - a;    c.printcomplex();    d.printcomplex();    return 0;}

注意：printcomplex( )函数没有处理输出的细节。

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