模板类友元函数

/** 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： object.cpp* 作者：王飞* 完成日期： 2013年  4 月 16日* 版本号： v1.0* 输入描述：无* 问题描述：每个成员函数前都要加模板template<class numtype>* 程序输出：略。*/#include <iostream>using namespace std;template <class numtype>  //声明一个模板，虚拟类型名numtypeclass Complex{public:Complex(){real=0;imag=0;}Complex(numtype r,numtype i){real=r;imag=i;}Complex complex_add(Complex &);Complex complex_minus(Complex &c2);    Complex complex_multiply(Complex &c2);void display();private:numtype real;  //私有成员也要是模板类型numtype imag;};template<class numtype>   //复数相加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>     //复数相减Complex<numtype> Complex<numtype>::complex_minus(Complex<numtype> &c2){Complex <numtype>c;c.real=real-c2.real;c.imag=imag-c2.imag;return c;}template<class numtype>     //复数相乘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>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_add(c5);cout<<"c4+c5=";c6.display( );c6=c4.complex_minus(c5);cout<<"c4-c5=";c6.display( );c6=c4.complex_multiply(c5);cout<<"c4*c5=";c6.display( );return 0;}

输出结果:

心得体会:

模板解决了重复函数的调用,方便了大家!