第8周实验报告1

/* (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：定义一个复数类重载运算符+、-、*、/，使之能用于复数的加减乘除。

* 作    者：         刘程程                    
* 完成日期：     2012    年 04      月  9  日
* 版 本 号：       V1.0   
* 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： 


* 程序头部的注释结束

*/

方案一：用类的成员函数完成运算符的重载：

#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);
 void display();
private:
 double real;
 double imag;
};
//下面定义成员函数

Complex Complex::operator +(Complex &c2)
{
 Complex c;
 c.real = real + c2.real;
 c.imag = imag + c2.imag;
 return c;
}

Complex Complex::operator -(Complex &c2)
{
 Complex c;
 c.real = real - c2.real;
 c.imag = imag - c2.imag;
 return c;
}

Complex Complex::operator *(Complex &c2)
{
 Complex c;
 c.real = real * c2.real - imag * c2.imag;
 c.imag = imag * c2.real + real * c2.imag;
 return c;
}

Complex Complex::operator /(Complex &c2)
{
 Complex c;
 c.real = (real*c2.real+imag*c2.imag)/(c2.real*c2.real+c2.imag*c2.imag);
 c.imag = (c2.real*imag-real*c2.imag)/(c2.real*c2.real+c2.imag*c2.imag);
 return c;
}
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;
}


 方案二：用类的友元函数完成上面提及的运算符的重载
#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.imag+c1.imag*c2.real, c1.real*c2.real-c1.imag*c2.imag);
 }

 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;
}

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;
}