《第八周实验报告任务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：    复数类中的运算符重载                        
* 作    者：       刘江波                      
* 完成日期：    2012     年    04   月   07     日
* 版 本 号：     v.04071    

* 对任务及求解方法的描述部分
* 问题描述：实现复数类中的运算符重载,定义一个复数类重载运算符+、-、*、/，使之能用于复数的加减乘除。
（1）方案一：请用类的成员函数完成运算符的重载； 

（2）方案二：请用类的友元函数，而不是成员函数，完成上面提及的运算符的重载；
（3）方案三：在方案二的基础上，扩展+、-、*、/运算符的功能，使之能与double型数据进行运算。设Complex c; double d; c?d和d?c的结果为将d视为实部为d的复数同c运算的结果（其中?为+、-、*、/之一）。另外，定义一目运算符-，-c相当于0-c。
* 程序头部的注释结束
1-1

#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;

	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;
}

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;
}

1-2

#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;
};
//下面定义友员函数
Complex operator+(Complex &c1,Complex &c2)//将双目运算符重载为友元函数时，在函数的形参列表中必须有两个参数，不能省略。
{
{
	Complex c;

	c.real = c1.real + c2.real;

	c.imag = c1.imag + c2.imag;

	return c;
}
Complex operator-(Complex &c1,Complex &c2)
{
	Complex c;

	c.real = c1.real - c2.real;

	c.imag = c1.imag - c2.imag;

	return c;
}
Complex operator*(Complex &c1,Complex &c2)
{
	Complex c;

	c.real = c1.real * c2.real;

	c.imag = c1.imag * c2.imag;

	return c;
}
Complex operator/(Complex &c1,Complex &c2)
{
	Complex c;

	c.real = c1.real / c2.real;

	c.imag = c1.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;

}

 

1-3

#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);

friend Complex operator+(double &d,Complex &c);
friend Complex operator-(double &d,Complex &c);
friend Complex operator*(double &d,Complex &c);
friend Complex operator/(double &d,Complex &c);

friend Complex operator+(Complex &c,double &d);
friend Complex operator-(Complex &c,double &d);
friend Complex operator*(Complex &c,double &d);
friend Complex operator/(Complex &c,double &d);

friend Complex operator-(Complex &c);

void display();

private:
double real;
double imag;
};
//下面定义友员函数
Complex operator+(Complex &c1,Complex &c2)//将双目运算符重载为友元函数时，在函数的形参列表中必须有两个参数，不能省略。
{
	Complex c;

	c.real = c1.real + c2.real;

	c.imag = c1.imag + c2.imag;

	return c;
}
Complex operator-(Complex &c1,Complex &c2)
{
	Complex c;

	c.real = c1.real - c2.real;

	c.imag = c1.imag - c2.imag;

	return c;
}
Complex operator*(Complex &c1,Complex &c2)
{	
	Complex c;

	c.real = c1.real * c2.real;

	c.imag = c1.imag * c2.imag;

	return c;
}
Complex operator/(Complex &c1,Complex &c2)
{
	Complex c;

	c.real = c1.real / c2.real;

	c.imag = c1.imag / c2.imag;

	return c;
}
 Complex operator+(double &d,Complex &c)
{
	return Complex(d+c.real,c.imag);
}
 Complex operator-(double &d,Complex &c)
{
	return Complex(d-c.real,c.imag);
}
 Complex operator*(double &d,Complex &c)
{
	return Complex(d*c.real,c.imag);
}
 Complex operator/(double &d,Complex &c)
{
	return Complex(d/c.real,c.imag);
}

Complex operator+(Complex &c,double &d)
{
	return Complex(d+c.real,c.imag);
}
Complex operator-(Complex &c,double &d)
{
	return Complex(c.real-d,c.imag);
}
Complex operator*(Complex &c,double &d)
{
	return Complex(d*c.real,c.imag);
}
Complex operator/(Complex &c,double &d)
{
	return Complex(c.real/d,c.imag);
}
void Complex::display()
{
	cout<<"("<<real<<","<<imag<<"i)"<<endl;
}
Complex operator-(Complex &c)
{
	return Complex(-c.real,-c.imag);
}

int main()
{
	Complex c(3,5),c1(3,4),c2(5,-10),c3;

	double d=15;

	cout<<"c=";

	c.display();

	cout<<"c1=";

	c1.display();

	cout<<"c2=";

	c2.display();

	cout<<"d="<<d<<endl;;

	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=c+d;

	cout<<"c+d=";

	c3.display();

	c3=d+c;

	cout<<"d+c=";

	c3.display();

	c3=c-d;

	cout<<"c-d=";

	c3.display();

	c3=d-c;

	cout<<"d-c=";

	c3.display();

	c3=c*d;

	cout<<"c*d=";

	c3.display();

	c3=d*c;

	cout<<"d*c=";

	c3.display();

	c3=c/d;

	cout<<"c/d=";

	c3.display();

	c3=d/c;

	cout<<"d/c=";

	c3.display();

	c3=-c;

	cout<<"-c=";

	c3.display();

	system("pause");;

	return 0;
}

知识点总结：

1)、将双目运算符重载为友元函数时，在函数的形参列表中必须有两个参数，不能省略。

2）、Complex operator(Complex &c,int &i)与Complex operator(int &i，Complex &c)都重载时，不能将两个都作为成员函数，但可以都是友元函数，或一个成员函数，一个友元函数。

3）、一般将单目运算符重载为成员函数，将双目运算符重载为友元函数。

4）、单目运算符重载函数只有一个参数，如果运算符重载为成员函数，则可省略此参数。