p331 例10.7重载《运算符.cpp

谭浩强 《C++ 程序设计》第三版的部分课后练习题源码

#include<iostream>
using namespace std;
class Complex
{
      public:
      Complex(int a=0,int b=0):real(a),imag(b){}
      Complex operator+(Complex &a);
      void display();
      private:
              int real;
              int imag;
};

void Complex::display()
{    if(imag>0)  cout<<real<<"+"<<imag<<"i"<<endl;
     else if(imag<0)  cout<<real<<"-"<<imag<<"i"<<endl;
     else cout<<real<<endl;
}

Complex Complex::operator+(Complex &a)
{
        return(Complex(a.real+real,a.imag+imag));
}

int main()
{
    Complex c1(3,4),c2(6,8),c3,c4;
    c3=c1+c2;
    c1.display();
    c2.display();
    cout<<"c3=c1+c2"<<endl;
    c3.display();
    c4=Complex(2,7);
    c4.display();
    system("pause");
    return 0;
    }