面向对象程序设计上机练习十（运算符重载）

#include <iostream>
#include <string>
#include <algorithm>

using namespace std;

class Complex
{
    private:
      int real, imag;
    public:
      Complex()
      {
          real=0; imag=0;
      }
      Complex(double r, double i)
      {
          real=r; imag=i;
      }
      friend Complex operator +(Complex &c1, Complex &c2 )
      {
          return Complex(c1.real+c2.real, c1.imag+c2.imag );
      }

      friend Complex operator +(int &i, Complex &c2)
      {
          return Complex(i+c2.real, c2.imag );
      }
      friend Complex operator +(Complex &c1, int &i )
      {
          return Complex(i+c1.real, c1.imag );
      }
      void sett();
      void disp();
}c1,c2;

void Complex::sett()
{
    cin>>real>>imag;
}

void Complex::disp()
{
    if(imag<0)
    {
        cout<<real<<imag<<‘i‘<<endl;
    }
    else
    cout<<real<<‘+‘<<imag<<‘i‘<<endl;
}

int main()
{
    int ii;
    Complex a, b, c;

    c1.sett();
    c2.sett();
    cin>>ii;

    a=c1+c2;
    a.disp();

    b=c1+ii;
    b.disp();

    c=ii+c1;
    c.disp();

    return 0;
}