Example introduction of constructor and destructor in C++

This article introduces the knowledge of "introduction of constructors and destructors in C++". Many people will encounter this dilemma in the operation of actual cases. then let the editor lead you to learn how to deal with these situations. I hope you can read it carefully and be able to achieve something!

Catalogue

Constructor function

Default constructor

Parametric constructor

Destructor function

Examples of destructing functions

Timing of destructor execution

Local object

Global object

Constructor function

Constructor (constructor) is a special member function. It is executed each time a new object of the class is created. The name of the constructor is exactly the same as the name of the class and does not return any type. The constructor can be used to set initial values for some member variables.

Format:

Class::Class (); / / Constructor default constructor

If the user does not define a constructor, the C++ system automatically generates a default constructor. The constructor body is empty, has no parameters, and does not perform initialization operations.

For example:

Time.h:

Class Time {private: int hour; int minute; int second;public: Time (); / / default constructor void set_time (int h, int m, int s); void show_time ();}

Time.cpp:

# include "Time.h" # include using namespace std;Time::Time () {hour = 0; minute = 0; second = 0;} void Time::set_time (int h, int m, int s) {hour = h; minute = m; second = s;} void Time::show_time () {cout