C++学习，my first class

这是一个复数类，第一个自己设计的类。

 

/*complexL.h*/#ifndef PLURAL_H_#define PLURAL_H_#include<iostream>class complex{private:double m_r ; //实数double m_u ; //虚数public:complex(double r = 0.0 ,double u = 0.0 ) { m_r = r ; m_u = u ;} ~complex() {} //operator overloading complex operator+(complex &t) ;complex operator-(complex &t) ;complex operator*(complex &t) ;complex operator~(void) ; //friendsfriend complex operator*(double x , complex &t) ;friend complex operator*(complex &t ,double x) ;friend std::ostream & operator << (std::ostream & os, const complex &c) ;friend std::istream & operator >> (std::istream & is, complex &c) ;} ;#endif

/*complexL.cpp*/#include<iostream>#include"Plural.h"//operator overloading complex complex::operator+(complex &t){return complex(m_r + t.m_r , m_u + t.m_u) ; //调用构造函数}complex complex::operator-(complex &t){return complex(m_r - t.m_r , m_u - t.m_u) ;}complex complex::operator*(complex &t){return complex(m_r * t.m_r - m_u * t.m_u , m_r * t.m_u + m_u * t.m_r ) ;}complex complex::operator~(void){return complex(m_r,-m_u) ;} //friendscomplex operator*(double x , complex &t){return t * complex(x) ;}std::ostream & operator << (std::ostream & os, const complex &c){os << "( " << c.m_r << "," << c.m_u << "i)/n" ;return os ;}std::istream & operator >> (std::istream & is, complex &c){using std::cout ;cout << "real : " ;if((is >> c.m_r)){cout << "imaginary: " ;is >> c.m_u ;}return is ; //如果错误输入的话，则会留下一个错误标志}

/*complexTest.cpp*/#include<iostream>#include"Plural.h"using namespace std ;int main(void){complex a(3.0,4.0) ;complex c ;cout << "Enter a complex number (q to quit) : /n" ;while(cin >> c){cout << "c is " << c << '/n' ;cout << "complex xonjugat is " << ~c << '/n' ;cout << "a is " << a << '/n' ;cout << "a + c is " << a+c << '/n' ;cout << "a - c is " << a-c << '/n' ;cout << "a * c is " << a*c << '/n' ;cout << "2 * c is " << 2*c << '/n' ;cout << "Enter a complex number(q to quit) : /n" ;}cout << "Done ! /n" ;return 0 ;}