学步园

/*     
* 程序的版权和版本声明部分     
* Copyright (c)2013, 烟台大学计算机学院学生     
* All rightsreserved.     
* 文件名称： 复数模板类.cpp     
* 作者：李巧丽     
* 完成日期： 2013 年4 月12日     
* 版本号： v1.0     
* 输入描述：无     
* 问题描述: 类成员函数在类外定义，同时实现加减乘除法的运算
* 程序输出：复数   
*/         
#include<iostream>
using namespace std;
template<class numtype>
class Complex
{
    public:
    Complex(){real=0;imag=0;}//定义构造函数
    Complex(double r,double i){real=r;imag=i;}//构造函数重载
    Complex complex_add(Complex &c2);//声明复数相加的函数
    Complex complex_subtract(Complex<numtype>&c2);//声明复数相减的函数
    Complex complex_multiply(Complex<numtype>&c2);//声明复数相乘的函数
    Complex complex_divide(Complex<numtype>&c2);//声明复数相除的函数
    void display();//声明输出函数
    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,-10),c3;
	c3=c1.complex_add(c2);  //需要在模板类中有一个成员函数支持加法运算，有一个形参
	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(5.34,-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<<"c4/c5=";
	c6.display( );

	return 0;
}

运行结果：

心得体会：英语单词好复杂啊，模板类写起来挺麻烦，但对于此类的运算确实方便