englio.cpp

来自「本课程主要介绍面向对象程序设计的方法和c++语言的基本概念。以c++语言中的面向」· C++ 代码 · 共 46 行

// englio.cpp
// overloaded << and >> operators
#include <iostream>
using namespace std;
////////////////////////////////////////////////////////////////
class Distance                           //English Distance class
   {
   private:
      int feet;
      float inches;
   public:
      Distance() : feet(0), inches(0.0)  //constructor (no args)
         {  }
                                         //constructor (two args)
      Distance(int ft, float in) : feet(ft), inches(in)         
         {  }
      friend istream& operator >> (istream& s, Distance& d);  
      friend ostream& operator << (ostream& s, Distance& d);
   };
//--------------------------------------------------------------
istream& operator >> (istream& s, Distance& d)  //get Distance
   {                                            //from user
   cout << "\nEnter feet: ";  s >> d.feet;      //using
   cout << "Enter inches: ";  s >> d.inches;    //overloaded
   return s;                                    //>> operator
   }
//--------------------------------------------------------------
ostream& operator << (ostream& s, Distance& d)  //display
   {                                            //Distance
   s << d.feet << "\'-" << d.inches << '\"';    //using
   return s;                                    //overloaded
   }                                            //<< operator
////////////////////////////////////////////////////////////////
int main()
   {
   Distance dist1, dist2;          //define Distances
   Distance dist3(11, 6.25);       //define, initialize dist3

   cout << "\nEnter two Distance values:";
   cin >> dist1 >> dist2;          //get values from user
                                   //display distances
   cout << "\ndist1 = " << dist1 << "\ndist2 = " << dist2;
   cout << "\ndist3 = " << dist3 << endl;
   return 0;
   }