c++ 使用构造函数和析构函数

[c++]代码库

#include <iostream> // for cout
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;
}

Cat::~Cat() // destructor, takes no action
{
}

// 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() {
	std::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();
	std::cout << "Frisky is a cat who is ";
	std::cout << Frisky.GetAge() << " years old.\n";
	Frisky.Meow();
	Frisky.SetAge(7);
	std::cout << "Now Frisky is ";
	std::cout << Frisky.GetAge() << " years old.\n";

	return 0;
}