第6周项目6复数模板类（友元函数）

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#include <iostream>using namespace std;template <class T1>class Complex{public:    Complex( )    {        real=0;        imag=0;    }    Complex(T1 a,T1 b)    {        real=a;        imag=b;    }    Complex complex_add(Complex &c);    template <class T2> friend Complex<T2> add_complex(Complex<T2> &c1,Complex<T2> &c2);//利用了模板的外部函数要作为友元函数，注意声明方式：类声明中也必须给出模板声明    void display();private:    T1 real;    T1 imag;};template<class T1>Complex<T1> Complex<T1>::complex_add(Complex<T1> &c){    Complex<T1> a;    a.real=real+c.real;    a.imag=imag+c.imag;    return a;}template<class T1>Complex<T1> add_complex(Complex<T1> &c1,Complex<T1> &c2){    Complex<T1> c;    c.real=c1.real+c2.real;    c.imag=c1.imag+c2.imag;    return c;}template<class T1>void Complex<T1>::display(){    cout<<'('<<real<<','<<imag<<')'<<endl;}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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