Shulou(Shulou.com)06/03 Report--

This article mainly explains "the overview and introduction of the pointer in C++", interested friends may wish to have a look. The method introduced in this paper is simple, fast and practical. Next, let the editor take you to learn the "overview and introduction of the role of pointers in C++".

Catalogue

Overview

A pointer to an object

Pointers to object data members

This pointer

The function of this pointer

Implementation of this pointer

Overview

A pointer is a variable that refers to the address of another variable. That is, the direct address of memory location.

A pointer to an object

When creating an object, the compiler allocates a certain storage space for each object to store its members.

We can define a pointer variable that holds the pointer to the object. For example:

Time time1;Time * p; / / define the pointer in the format: class name * object pointer name p = & time1; / / point the pointer to the Time class object

We can access objects and their members through object pointers. For example:

Int main () {Time time1; Time * p; / / defines a pointer in the format: class name * object pointer name p = & time1; / / points the pointer to the Time class object p-> hour; / / equivalent to time1.hour p-> show_time (); / / equivalent to time1.show_time () pointer 0;} pointer to object data members

The member of the object also has an address, and the pointer variable that stores the address of the object member is the pointer variable that points to the object member.

Defining pointer variables to object data members is the same as defining pointer variables to different variables. For example:

Int main () {Time time1; int * p; / / defines the pointer in the format: class name * object pointer name p = & time1.hour; / / points the pointer to the hour member return 0;} of the time1 object

Access the member through a pointer variable to the object data member. For example:

Int main () {Time time1; int * p; / / defines the pointer in the format: class name * object pointer name p = & time1.hour; / / points the pointer to the hour member cout of the time1 object

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