* Copyright (c) 2011, 烟台大学计算机学院学生
* All rights reserved.
* 文件名称: class time
* 作 者: 于昊
* 完成日期: 2012 年 03 月 25 日
* 版 本 号: 1.0
* 对任务及求解方法的描述部分
* 输入描述:
* 问题描述:
* 程序输出:
* 问题分析:
* 算法设计:……
#include <iostream> using namespace std; class Complex { public: Complex(){real=0;imag=0;} Complex(double r,double i){real=r;imag=i;} friend Complex operator+(Complex &c1,Complex &c2); friend Complex operator-(Complex &c1,Complex &c2); friend Complex operator*(Complex &c1,Complex &c2); friend Complex operator/(Complex &c1,Complex &c2); void display(); private: double real; double imag; }; //下面定义成员函数 Complex operator+(Complex &c1,Complex &c2) { return Complex(c1.real+c2.real,c1.imag+c2.imag); } Complex operator-(Complex &c1,Complex &c2) { return Complex(c1.real-c2.real,c1.imag-c2.imag); } Complex operator*(Complex &c1,Complex &c2) { return Complex(c1.real*c2.real,c1.imag*c2.imag); } Complex operator/(Complex &c1,Complex &c2) { return Complex(c1.real/c2.real,c1.imag/c2.imag); } void Complex::display() { cout<<"("<<real<<","<<imag<<"i)"<<endl; } int main() { Complex c1(3,4),c2(5,-10),c3; cout<<"c1="; c1.display(); cout<<"c2="; c2.display(); c3=c1+c2; cout<<"c1+c2="; c3.display(); c3=c1-c2; cout<<"c1-c2="; c3.display(); c3=c1*c2; cout<<"c1*c2="; c3.display(); c3=c1/c2; cout<<"c1/c2="; c3.display(); system("pause"); return 0; }
上机感言:使用类的友元函数时,参数要写两个c1和c2.
友元函数本来就可以使用类外的函数所以在类外定义函数时不用加上域运算符。