C++学习笔记(1)-----Complex类运算符重载

       最近在学习iphone开发，上着培训班，要从C，C++学起。虽然之前学校里已经学习过这两种语言。但是最近在学习的过程中，我发现自己已经忘记了蛮多知识点了。记得当时学C++ 的时候，觉得运算符重载比较恶心，没好好看它，今天在做C++的作业时，碰到它了，我就头疼。果然一开始写得很不顺手，于是拿着“谭哥”的书，仔仔细细地把运算符重载那章看了一遍。于是写下下面这些东西。（这个是个作业噢~学习C++的童鞋都要写的噢~）如果有不对的地方，希望指出。

---------------------------------------------------complex.h文件---------------------------------------------------

#ifndef COMPLEX_HEADER#define COMPLEX_HEADER#include<iostream>using namespace std;class Complex{public:        Complex();        Complex(double r);        Complex(double r,double i);        friend const Complex operator +(const Complex &c1,const Complex &c2);        friend const Complex operator -(const Complex &c1,const Complex &c2);        friend const Complex operator *(const Complex &c1,const Complex &c2);        friend const Complex operator /(const Complex &c1,const Complex &c2);        friend Complex operator -=(Complex &c1,Complex &c2);        friend Complex operator --(Complex &c1);        friend Complex operator *=(Complex &c1,Complex &c2);        friend Complex operator /=(Complex &c1,Complex &c2);        friend bool operator ==(Complex &c1,Complex &c2);        friend bool operator !=(Complex &c1,Complex &c2);        friend istream& operator >>(istream &in,Complex &c);        void show();private:        double real;        double imag;};#endif

--------------------------------------------------complex.cpp文件--------------------------------------------------

#include"complex.h"//无参数的构造函数Complex::Complex(){real = 0;    imag = 0;}//带一个参数的构造函数Complex::Complex(double r){real = r;imag = 0;}//带两个参数的构造函数Complex::Complex(double r,double i){    real = r;    imag = i;}//“+”运算符重载函数const Complex operator +(const Complex &c1,const Complex &c2){return Complex(c1.real+c2.real,c1.imag+c2.imag);}//“-”运算符重载函数const Complex operator - (const Complex &c1,const Complex &c2){return Complex(c1.real-c2.real,c1.imag-c2.imag);}//“*”运算符重载函数const Complex operator * (const Complex &c1,const Complex &c2){return Complex(c1.real*c2.real-c1.imag*c2.imag,c1.real*c2.imag+c1.imag*c2.real);}//“/”运算符重载函数const Complex operator / (const Complex &c1,const Complex &c2){if((c2.real == 0) && (c2.imag == 0)){exit(1);}double den = c2.real*c2.real+c2.imag*c2.imag;    return Complex((c1.real * c2.real + c1.imag * c2.imag) /den ,(c1.imag * c2.real -c1.real * c2.imag) /den);}//“>>”运算符重载函数istream& operator >>(istream &in,Complex &c){cout<<"请输入一个复数：";in>>c.real>>c.imag;if(!in){Complex(0,0);}return in;}//“--”运算符重载函数Complex operator --(Complex &c1){return c1=Complex(c1.real-1,c1.imag-1);}//“-=”运算符重载函数Complex operator -=(Complex &c1,Complex &c2){return c1=Complex(c1.real-c2.real,c1.imag-c2.imag);}//在“-”重载的基础上,“--”运算符重载函数Complex operator --(Complex &c1){return c1=c1-Complex(1,1);}//在“-”重载的基础上,“-=”运算符重载函数Complex operator -=(Complex &c1,Complex &c2){return c1=c1-c2;}//“*=”运算符重载函数Complex operator *=(Complex &c1,Complex &c2){return c1=Complex(c1.real*c2.real-c1.imag*c2.imag,c1.real*c2.imag+c1.imag*c2.real);}//“/=”运算符重载函数Complex operator /=(Complex &c1,Complex &c2){if((c2.real == 0) && (c2.imag == 0)){exit(1);}double den = c2.real*c2.real+c2.imag*c2.imag;return c1=Complex((c1.real * c2.real + c1.imag * c2.imag) /den ,(c1.imag * c2.real -c1.real * c2.imag) /den);}//“==”运算符重载函数,复数相等bool operator ==(Complex &c1,Complex &c2){if(c1.real==c2.real && c1.imag==c2.imag){return true;}return false;}//“!=”运算符重载函数,复数相等bool operator !=(Complex &c1,Complex &c2){if(c1.real!=c2.real && c1.imag!=c2.imag){return true;}return false;}//复数显示函数void Complex::show(){        cout<< real << (imag>=0?"+":"")  << imag << "i"<<endl;}

------------------------------------------------complexTest.cpp文件------------------------------------------------

#include"complex.h"int main(void){int i;Complex c1(4),c2(2),c3(1,3),c4(4,6),c5(8,3),c6(7,2),c7(8,9),c8(3,3),c9(3,3);cout<<"-----------------------------"<<endl;cout<<"c1:";c1.show();cout<<"c2:";c2.show();c1-=c2;cout<<"c1-=c2: ";c1.show();cout<<"-----------------------------"<<endl;cout<<"c3:";c3.show();cout<<"c4:";c4.show();c3*=c4;cout<<"c3*=c4: ";c3.show();cout<<"-----------------------------"<<endl;cout<<"c5:";c5.show();cout<<"c6:";c6.show();c5/=c6;cout<<"c5/=c6: ";c5.show();cout<<"-----------------------------"<<endl;cout<<"c5:";c5.show();cout<<"c6:";c6.show();if(c5==c6){cout<<"c5与c6相等！"<<endl;}else{cout<<"c5与c6不相等！"<<endl;}cout<<"-----------------------------"<<endl;cout<<"c7:";c7.show();c7--;cout<<"c7--: ";c7.show();cout<<"-----------------------------"<<endl;cout<<"c8:";c8.show();cout<<"c9:";c9.show();if(c8!=c9){cout<<"c8与c9不相等！"<<endl;}else{cout<<"c8与c9相等！"<<endl;}while(1);    return 0;}