7周任务3.类模板的使用

#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); //   复数相加函数  
	Complex complex_subtract(Complex <numtype> &c2);  // 复数相减函数  
	Complex complex_multiply(Complex <numtype> &c2); //   复数相乘函数
	Complex complex_divide(Complex <numtype> &c2);    //   相除函数
	void display( );     //
private:  
	double real;   
	double imag;   
};  

template <class numtype>  
Complex<numtype> Complex<numtype>::complex_add(Complex <numtype> &c2)  //复数相加函数
{  
	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)  //  复数相减函数
{  
	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)  // 复数相乘函数 
{  
	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)  //复数相除函数 
{  
	Complex <numtype> c;  
	c.real=(real*c2.real+c2.imag*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( )   //输出复数函数  
{  
	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( );  

	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<<"c2/c1=";   
	c3.display( );  

	Complex<double>   c4(3.1,4.4),c5(5.34,-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<<"c5/c4=";   
	c6.display( );  
	system("pause");  
	return 0;  
}  

运行结果：

感言：利用类模板，增强了类程序的使用性。。。增多了数据类的定义，更方便。。。