/* (程式頭部註釋開始)
* 程式的版權和版本宣告部分
* Copyright (c) 2011, 煙臺大學計算機學院學生 
* All rights reserved.
* 檔名稱：實現一個複數類，通過模板類的技術手段，設計Complex，使實部和虛部的型別為定義物件時用的實際型別

* 作    者：         雷恆鑫                       
* 完成日期：     2012    年 03      月    29  日
* 版 本 號：       V1.0   
* 對任務及求解方法的描述部分
* 輸入描述： 
* 問題描述： 
* 程式輸出： 

* 程式頭部的註釋結束

*/

#include <iostream>
using namespace std;
template <class numtype>
class Complex   
{
public:
	Complex( ){real=0;imag=0;}     
	Complex(numtype r,numtype i){real=r;imag=i;} 
	Complex complex_add(Complex &c2); 
	Complex complex_subtract(Complex &c2); 
	Complex complex_multiply(Complex &c2); 
	Complex complex_divide(Complex &c2); 
	void display( );   
private:
	numtype real; 
	numtype imag; 
};
template <class numtype>
Complex<numtype> Complex<numtype>::complex_add(Complex &c2)
{
	Complex c;
	c.real=real+c2.real;
	c.imag=imag+c2.imag;
	return c;
} 
template <class numtype>
Complex<numtype> Complex<numtype>::complex_subtract(Complex &c2)
{
	Complex c;
	c.real=real-c2.real;
	c.imag=imag-c2.imag;
	return c;
}
template <class numtype>
Complex<numtype> Complex<numtype>::complex_multiply(Complex &c2)
{
	Complex c;
	c.real=real*c2.real-imag*c2.imag;
	c.imag=real*c2.imag+imag*c2.real;
	return c;
} 
template <class numtype>
Complex<numtype> Complex<numtype>::complex_divide(Complex &c2)
{
	Complex c,c3,c4;
	c3.real=c2.real;
	c3.imag=c2.imag;

	c.real=real*c3.real+imag*c3.imag;
	c.imag=(-real*c3.imag)+imag*c3.real;  
	c4.real=c2.real*c2.real+c2.imag*c3.imag;
	c.real=c.real/c4.real;
	c.imag=c.imag/c4.real;
	return c;
}  
template <class numtype>  
void Complex<numtype>::display( )   
{
	cout<<"("<<real<<","<<imag<<"i)"<<endl;
}
int main( )
{	
	Complex<int> c1(3,4),c2(5,-10),c3;  
	c3=c1.complex_add(c2);  
	cout<<"c1+c2="; 
	c3.display( );  
	Complex<double> c4(3.1,4.4),c5(5.34,-10.21),c6;  
	c6=c4.complex_subtract(c5);  
	cout<<"c4-c5="; 
	c6.display( ); 

	Complex<double> c7(2,4.4),c8(5.34,-10.21),c9;  
	c9=c7.complex_multiply(c8);  
	cout<<"c7*c8="; 
	c9.display( ); 

	Complex<double> c10(3,-2),c11(5,10),c12;  
	c12=c10.complex_divide(c11);  
	cout<<"c10/c11="; 
	c12.display( ); 
	system("pause");
	return 0;
}

 

執行結果：

經驗積累：

1.在類外定義Complex complex_add(Complex &c2)函式時為什麼要加“Complex<numtype>”Complex<numtype>::complex_add(Complex &c2)

課本上沒說要加“Complex<numtype>”