7週目タスク-テンプレートクラス

/*
*             
* Copyright (c)2013,            
* All rightsreserved.
*     ：      .cpp
*   ：   
*     ： 2013  4  19 
*    ： v1.0
*     ： 
*     :           ，            
*     ：  
*/
#include<iostream>
using namespace std;
template<class numtype>
class Complex
{
    public:
    Complex(){real=0;imag=0;}//      
    Complex(double r,double i){real=r;imag=i;}//      
    Complex complex_add(Complex &c2);//         
    Complex complex_subtract(Complex<numtype>&c2);//         
    Complex complex_multiply(Complex<numtype>&c2);//         
    Complex complex_divide(Complex<numtype>&c2);//         
    void display();//      
    private:
    double real;
    double imag;
};
template<class numtype>
Complex<numtype>Complex<numtype>::complex_add(Complex<numtype>&c2)
{
   Complex<numtype>c;
   c.real=real+c2.real;
   c.imag=imag+c2.imag;
   return c;
}
template<class numtype>
Complex<numtype>Complex<numtype>::complex_subtract(Complex<numtype>&c2)
{
   Complex<numtype>c;
   c.real=real-c2.real;
   c.imag=imag-c2.imag;
   return c;
}
template<class numtype>
Complex<numtype>Complex<numtype>::complex_multiply(Complex<numtype>&c2)
{
   Complex<numtype>c;
   c.real=real*c2.real-imag*c2.imag;
   c.imag=imag*c2.real+real*c2.imag;
   return c;
}
template<class numtype>
Complex<numtype>Complex<numtype>::complex_divide(Complex<numtype>&c2)
{
   Complex<numtype>c;
   c.real=(real*c2.real+imag*c2.imag)/(real*real+imag*imag);
   c.imag=(c2.imag*real-c2.real*imag)/(real*real+imag*imag);
   return c;
}
template<class numtype>
void Complex<numtype>::display()
{
   cout<<"("<<real<<","<<imag<<"i)"<<endl;
}
int main( )
{
	Complex<int> c1(3,4),c2(5,-12),c3;
	c3=c1.complex_add(c2);  //                    ，     
	cout<<"c1+c2=";
	c3.display( );
	c3=c1.complex_subtract(c2);//  
	cout<<"c1-c2=";
    c3.display( );
	c3=c1.complex_multiply(c2);//  
	cout<<"c1*c2=";
	c3.display( );
	c3=c1.complex_divide(c2);//  
	cout<<"c1/c2=";
	c3.display( );
	Complex<double> c4(3.1,4.4),c5(5.4,-10.21),c6;
	c6=c4.complex_add(c5);
	cout<<"c4+c5=";
	c6.display( );
	c6=c4.complex_subtract(c5);
	cout<<"c4-c5=";
    c6.display( );
	c6=c4.complex_multiply(c5);
	cout<<"c4*c5=";
	c6.display( );
	c6=c4.complex_divide(c5);
	cout<<"c4/c5=";
	c6.display( );

	return 0;
}