第七周上机任务三--实现一个复数类--通过模板类的技术手段，设计Complex，使实部和虚部的类型为定义对象时用的实际类型

/* (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：实现一个复数类，通过模板类的技术手段，设计Complex，使实部和虚部的类型为定义对象时用的实际类型

* 作 者： 雷恒鑫

* 完成日期： 2012 年 03 月 29 日

* 版 本 号： V1.0

* 对任务及求解方法的描述部分

* 输入描述：

* 问题描述：

* 程序输出：

* 程序头部的注释结束

*/

#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;
}

运行结果：



经验积累：

1.在类外定义Complex complex_add(Complex &c2)函数时为什么要加“Complex<numtype>”Complex<numtype>::complex_add(Complex &c2)

课本上没说要加“Complex<numtype>”