8.1 實現複數類的運算符重載

* 程序的版權和版本聲明部分
* Copyright (c) 2011, 煙臺大學計算機學院學生
* All rights reserved.
* 文件名稱：   第八週 任務一                          
* 作    者：        楊森                     
* 完成日期：    2011     年   4    月    9    日
* 版 本 號：   1.0V

 

方案一：用類的成員函數實現函數重載

#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;
};

//下面定義成員函數
Complex Complex::operator+(Complex &c2)
{
	return Complex(real+c2.real,imag+c2.imag);
}

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

Complex Complex::operator*(Complex &c2)
{
	return Complex(real*c2.real,imag*c2.imag);
}

Complex Complex::operator/(Complex &c2)
{
	return Complex(real/c2.real,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;
}

運行結果：

 

方案二：用友員函數實現函數重載

#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;
};

//下面定義成員函數
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;
}

運行結果：

方案三：拓展與 double 型運算

#include <iostream>
using namespace std;
class Complex
{
public:
 Complex(){real=0;imag=0;}
 Complex(double r,double i){real=r;imag=i;}
 Complex operator+(double b);
 Complex operator-(double b);
 Complex operator*(double b);
 Complex operator/(double b);
    Complex operator -();
 void display();
private:
 double real;
 double imag;
};

//下面定義成員函數
Complex Complex:: operator+(double b)
{
 return Complex(real+b,imag);
}

Complex Complex:: operator-(double b)
{
 return Complex(real-b,imag);
}

Complex Complex:: operator*(double b)
{
 return Complex(real*b,imag*b);
}

Complex Complex:: operator/(double b)
{
 return Complex(real/b,imag/b);
}

Complex Complex:: operator-()
{
 return Complex(0-real,0-imag);
}

void Complex::display()
{
 cout<<"("<<real<<","<<imag<<"i)"<<endl;
}

int main()
{
 Complex c(3,4),c3;
 double b=3;
 cout<<"c";
 c.display();
 cout<<"b="<<b<<endl;
 c3=-c;
 cout<<"-c=";
 c3.display();
 cout<<"c+b=";
 c3.display();
 c3=c-b;
 cout<<"c-b=";
 c3.display();
 c3=c*b;
 cout<<"c*b=";
 c3.display();
 c3=c/b;
 cout<<"c/b=";
 c3.display();
 system("pause");
 return 0;
}

運行結果：

 

小感：不斷錯，不斷改，還是覺得有點小問題