2015年大一下第5周项目6-复数模板类(2)复数模板类友元函数

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/**Copyright (c) 2014,烟台大学计算机学院*All rights reserved.*文件名称:Annpion.cpp*作者:王耀鹏*完成日期:2015年4月15日*版本号:v1.0**问题描述:阅读教材例10.1。该例实现了一个复数类，但是美中不足的是，复数类的实部和虚部都固定只能是double型的。可以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指定的实际类型。*输入描述:无。*输出描述:复数的加减乘除。*/#include<iostream>using namespace std;template <class T>class Complex{public:    Complex(){real=0;imag=0;}    Complex(T r,T i){real=r;imag=i;}    Complex complex_add(Complex &c2);    Complex complex_minus(Complex &c2);    Complex complex_multiply(Complex &c2);    Complex complex_divide(Complex &c2);    void display();    template<class T1>friend Complex<T1> add_complex(const Complex<T1> &c1,const Complex<T1> &c2);private:    T real;    T imag;};template <class T>Complex<T> Complex<T>::complex_add(Complex<T> &c2){    Complex<T> c;    c.real=real+c2.real;    c.imag=imag+c2.imag;    return c;}template <class T>Complex<T> Complex<T>::complex_minus(Complex &c2){    Complex<T> c;    c.real=real-c2.real;    c.imag=imag-c2.imag;    return c;}template <class T>Complex<T> Complex<T>::complex_multiply(Complex &c2){        Complex <T> c;    c.real=real*c2.real-imag*c2.imag;    c.imag=imag*c2.real+real*c2.imag;    return c;}template <class T>Complex<T> Complex<T>::complex_divide(Complex &c2){    Complex <T> c;    T d=c2.real*c2.real+c2.imag*c2.imag;    c.real=(real*c2.real+imag*c2.imag)/d;       //此处有危险未排除：除法溢出    c.imag=(imag*c2.real-real*c2.imag)/d;    return c;}template <class T>void Complex<T>::display(){    cout<<"("<<real<<","<<imag<<"i)"<<endl;}template <class T>Complex<T> add_complex(const Complex<T> &c1,const Complex<T> &c2){    Complex<T> c;    c.real=c1.real+c2.real;    c.imag=c1.imag+c2.imag;    return c;}int main( ){    Complex<int> c1(3,4),c2(5,-10),c3;    c3=c1.complex_add(c2);  //调用成员函数支持加法运算，有一个形参    cout<<"c1+c2=";    c3.display( );    Complex<double> c4(3.1,4.4),c5(5.34,-10.21),c6;    c6=c4.complex_add(c5);  //调用成员函数支持加法运算，有一个形参    cout<<"c4+c5=";    c6.display( );    Complex<int> c7;    c7=add_complex(c1,c2);  //调用友员函数支持加法运算，有两个形参    cout<<"c1+c2=";    c7.display( );    Complex<double> c8;    c8=add_complex(c4,c5);  //调用友员函数支持加法运算，有两个形参    cout<<"c4+c5=";    c8.display( );    return 0;}
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