//15_2_1

#include <iostream.h>

class Animal;

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

class Animal{
public:
  friend void SetValue(Animal&, int);
protected:
  int itsWeight;
  int itsAge;
};

void SetValue(Animal& ta, int tw)
{
  ta.itsWeight =tw;
}

void SetValue(Animal& ta, int tw, int tn)
{
  ta.itsWeight =tw;      //非成員函數(shù)或友員不能訪問(wèn)類(lèi)的私有數(shù)據(jù)
  ta.itsAge =tn;         //非成員函數(shù)或友員不能訪問(wèn)類(lèi)的私有數(shù)據(jù)
}

void main()
{
  Animal peppy;
  SetValue(peppy, 5);
  SetValue(peppy,7,9);
}