* (程序头部注释开始)
* 程序的版权和版本声明部分
* Copyright (c) 2011, 烟台大学计算机学院学生
* All rights reserved.
* 文件名称:
* 作者:吴瑕
* 完成日期: 2012年 04月 16日
* 版本号:
*对任务及求解方法的描述部分
* 输入描述:
定义Complex类中的<<和>>运算符的重载,实现输入和输出,改造原程序中对运算结果显示方式,使程序读起来更自然。
#include<iostream> using namespace std; class Complex { public: Complex(){real=0;imag=0;} Complex(double r,double i){real=r;imag=i;} Complex operator+(Complex &c2); Complex operator-(Complex &c2); Complex operator*(Complex &c2); Complex operator/(Complex &c2); //声明重载运算符函数 friend istream& operator >> (istream&,Complex& c); friend ostream& operator << (ostream&,Complex& c); private: double real; double imag; }; //下面定义成员函数 Complex Complex::operator+(Complex &c2) { Complex c1; c1.real=real+c2.real; c1.imag=imag+c2.imag; return c1; } Complex Complex::operator-(Complex &c2) { Complex c1; c1.real=real-c2.real; c1.imag=imag-c2.imag; return c1; } Complex Complex::operator*(Complex &c2) { Complex c; c.real=real*c2.real-imag*c2.imag; c.imag=real*c2.imag+imag*c2.real; return c; } Complex Complex::operator/(Complex &c2) { Complex c; c.real=(real*(c2.real)+imag*c2.imag)/((c2.imag*c2.imag)+real*real); c.imag=(imag*c2.real-real*c2.imag)/((c2.imag*c2.imag)+real*real); return c; } istream &operator >> (istream& input,Complex& c) { cout<<"请输入两个数"; input>>c.real>>c.imag; return input; } ostream &operator << (ostream& output,Complex& c) { if(c.imag>0) { output<<"("<<c.real<<"+"<<c.imag<<"i)"; } else { output<<"("<<c.real<<c.imag<<"i)"; } return output; } int main() { Complex c1,c2,c3; cin>>c1>>c2; cout<<endl; cout<<"c1="<<c1<<endl; cout<<"c2="<<c2<<endl; c3=c1+c2; cout<<"c1+c2="<<c3<<endl; c3=c1-c2; cout<<"c1-c2="<<c3<<endl; c3=c1*c2; cout<<"c1*c2="<<c3<<endl; c3=c1/c2; cout<<"c1/c2="<<c3<<endl; system("pause"); return 0; }
运行结果:
上机感言:
《和》的运算符的重载,就是实现对一个对象的输入输出,和其他函数的最大的区别就是返回值特殊。