复数四则运算--类模板实现

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#include<iostream>using namespace std;template<class numtype>class Complex {public:Complex(numtype a=0, numtype b=0) :x(a), y(b) {}Complex complex_add(Complex &);Complex complex_sub(Complex &);Complex complex_mul(Complex &);Complex complex_div(Complex &);void display();private:numtype x, y;};//每一个成员函数的定义前，必须要声明类模板//使用了模板的类，将不再独立使用，其类名的完整表示为“类模板名<虚拟类型参数>”  //凡用到类名处也用“类模板名<虚拟类型参数>”形式；template<class numtype>   Complex<numtype> Complex<numtype>::complex_add(Complex<numtype> &c) {Complex<numtype> nc;nc.x = x + c.x;nc.y = y + c.y;return nc;}template<class numtype>Complex<numtype> Complex<numtype>::complex_sub(Complex<numtype> &c) {Complex<numtype> nc;nc.x = x - c.x;nc.y = y - c.y;return nc;}template<class numtype>Complex<numtype> Complex<numtype>::complex_mul(Complex<numtype> &c) {Complex<numtype> nc;nc.x = x*c.x-y*c.y;nc.y = x*c.y+y*c.x;return nc;}template<class numtype>Complex<numtype> Complex<numtype>::complex_div(Complex<numtype> &c) {Complex<numtype> nc;nc.x = (x*c.x+y*c.y)/(c.x*c.x+c.y*c.y);nc.y = (y*c.x - x*c.y) / (c.x*c.x + c.y*c.y);return nc;}template<class numtype>void Complex<numtype>::display() {cout <<"("<< x <<","<<y<<"i)"<< endl;}int main(){Complex<int> c1(1, 2), c2(2, 4), c3;   //实部和虚部是int型  c3 = c1.complex_add(c2);cout << "c1+c2=";c3.display();c3 = c1.complex_sub(c2);cout << "c1-c2=";c3.display();c3 = c1.complex_mul(c2);cout << "c1*c2=";c3.display();c3 = c1.complex_div(c1);cout << "c1/c2=";c3.display();return 0;}
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