p339 例10.9 类的类型转换.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(double a=0,double b=0):real(a),imag(b){}
      Complex(double a)
      { real=a;  imag=0;  }
      friend Complex operator+(Complex &a,Complex &b);
      void display();
      
      private:
              double real;
              double 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 operator+(Complex &a,Complex &b)
{
       return(Complex(a.real+b.real,a.imag+b.imag));
}

int main()
{
    Complex c1(3,4),c2;
    double a=12.5;
  
    c2=c1+a;
    c2.display();
    system("pause");
    
    return 0;
    
    }