bug1607.cpp

teach yourself C++ in 21 days 第五版

   #include <iostream>
   using namespace std;
   class Animal;

   void setValue(Animal& , int);
   void setValue(Animal& ,int, int);

   class Animal
   {
      friend void setValue(Animal& ,int); // here's the change!
      private:
        int itsWeight;
        int itsAge;
  };
   
  void setValue(Animal& theAnimal, int theWeight)
  {
      theAnimal.itsWeight = theWeight;
  }
    
     
  void setValue(Animal& theAnimal, int theWeight, int theAge)
  {
     theAnimal.itsWeight = theWeight;
     theAnimal.itsAge = theAge;
  }
      
  int main()
  {
     Animal peppy;
     setValue(peppy,5);
     setValue(peppy,7,9);
     return 0;
  }