/* (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:运算符的重载
* 作 者: 张培培
* 完成日期:2012 年 04月 09日
* 版 本 号:
* 对任务及求解方法的描述部分
* 输入描述:
*问题描述:通过类的成员函数和友元函数分别实现运算符的重载
* 程序输出:
* 程序头部的注释结束*/
#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);//复数相加
friend Complex operator-(Complex &c1,Complex &c2);//复数相减
friend Complex operator*(Complex &c1,Complex &c2);//复数相乘
friend Complex operator/(Complex &c1,Complex &c2);//复数相除
friend Complex operator+(const double &a,Complex &c2);//实数与复数相加
friend Complex operator+(Complex &c1,const double &a);//复数与实数相数
friend Complex operator-(Complex &c1);//重载一目运算符,求复数的相反数
void display();
private:
double real;
double imag;
};
//下面定义成员函数
//复数相加
Complex operator+(Complex &c1,Complex &c2)
{
Complex c;
c.real=c1.real+c2.real;
c.imag=c1.imag+c2.imag;
return c;
}
//复数相减
Complex operator-(Complex &c1,Complex &c2)
{
Complex c;
c.real=c1.real-c2.real;
c.imag=c1.imag-c2.imag;
return c;
}
//复数相乘
Complex operator*(Complex &c1,Complex &c2)
{
Complex c;
c.real=c1.real*c2.real-c1.imag*c2.imag;
c.imag=c1.imag*c2.real+c1.real*c2.imag;
return c;
}
//复数相除
Complex operator/(Complex &c1,Complex &c2)
{
Complex c;
c.real=(c1.real*c2.real+c1.imag*c2.imag)/(c2.real*c2.real+c2.imag*c2.imag);
c.imag=(c1.imag*c2.real-c1.real*c2.imag)/(c2.real*c2.real+c2.imag*c2.imag);
return c;
}
//实数与复数相加
Complex operator+(const double &a,Complex &c2)
{
return Complex(a+c2.real,c2.imag);
}
//复数与实数相加
Complex operator+(Complex &c1,const double &a)
{
return Complex(c1.real+a,c1.imag);
}
//重载一目运算符,求复数的相反数
Complex operator-(Complex &c1)
{
return Complex(-c1.real,-c1.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();
c3=1.57+c2;
cout<<"1.57+c2=";
c3.display();
c3=c1+1.57;
cout<<"c1+1.57=";
c3.display();
c3=-c1;
c3.display();
system("pause");
return 0;
}
上机感言:复数与实数相加时可以通过成员函数和友元函数完成运算符的重载;
实数与复数相加时只能通过友元函数完成运算符的重载;
运算符重载时不能改变参数的个数;