2015-第6周项目6-复制模板类（1）&（2）

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【项目6-复数模板类】
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。
（1）要求类成员函数在类外定义。

（2）在此基础上，再实现减法、乘法和除法

代码：

#include <iostream>#include <cstring>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();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<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_multiply(Complex<T> &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<T> &c2){    Complex <T> c;    T d=c2.real*c2.real+c2.imag*c2.imag;    c.real=(real*c2.real+imag*c2.imag)/d;    c.imag=(imag*c2.real-real*c2.imag)/d;    return c;}template<class T>void Complex<T>::display( ){    cout<<"("<<real<<","<<imag<<"i)"<<endl;}int main( ){    Complex<int> c1(3,4),c2(5,-10),c3;   //实部和虚部是int型    c3=c1.complex_add(c2);    cout<<"c1+c2=";    c3.display();    c3=c1.complex_minus(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; //实部和虚部是double型    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( );    c6=c4.complex_divide(c5);    cout<<"c4/c5=";    c6.display( );    return 0;}

运行结果：

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