list0603.cpp

teach yourself C++ in 21 days 第五版

// Demonstrates declaration of a class and
// definition of class methods,
#include <iostream>         // for cout
 
class Cat                   // begin declaration of the class
{
  public:                   // begin public section
    int GetAge();           // accessor function
    void SetAge (int age);  // accessor function
    void Meow();            // general function
  private:                  // begin private section
    int itsAge;             // member variable
};
  
// GetAge, Public accessor function
// returns value of itsAge member
int Cat::GetAge()
{
   return itsAge;
}
  
// definition of SetAge, public
// accessor function
// sets itsAge member
void Cat::SetAge(int age)
{
   // set member variable itsAge to
   // value passed in by parameter age
   itsAge = age;
}
  
// definition of Meow method
// returns: void
// parameters: None
// action: Prints "meow" to screen
void Cat::Meow()
{
   std::cout << "Meow.\n";
}
  
// create a cat, set its age, have it
// meow, tell us its age, then meow again.
int main()
{
   Cat Frisky;
   Frisky.SetAge(5);
   Frisky.Meow();
   std::cout << "Frisky is a cat who is " ;
   std::cout << Frisky.GetAge() << " years old.\n";
   Frisky.Meow();
   return 0;
}