constructive.cpp

24学时攻克C++光盘源代码 深入浅出 方便实用

  // Demonstrates declaration of a constructor and
  // destructor for the Cat class
 #include <iostream>      // for std::cout
 using std::cout;         // always use std::cout in this file
 
 class Cat                // begin declaration of the class
 {
 public:                  // begin public section
     Cat(int initialAge); // constructor
     ~Cat();              // destructor
     int GetAge();        // accessor function
     void SetAge(int age);// accessor function
     void Meow();
 private:                 // begin private section
     int itsAge;          // member variable
 };
 
 // constructor of Cat,
 Cat::Cat(int initialAge)
 {
     itsAge = initialAge;
 }
 
 // destructor, takes no action
 Cat::~Cat()
 {
 
 }
 
 // GetAge, Public accessor function
 // returns value of itsAge member
 int Cat::GetAge()
 {
     return itsAge;
 }
 
 // Definition of SetAge, public
 // accessor function
 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()
 {
     cout << "Meow.\n";
 }
 
 // create a cat, set its age, have it
 // meow, tell us its age, then meow again.
 int main()
 {
     Cat Frisky(5);
     Frisky.Meow();
     cout << "Frisky is a cat who is " ;
     cout << Frisky.GetAge() << " years old.\n";
     Frisky.Meow();
     Frisky.SetAge(7);
     cout << "Now Frisky is " ;
     cout << Frisky.GetAge() << " years old.\n";
     return 0;
 }