Explanation of C language pointers and pointer Variables

Explanation of C language pointers and pointer Variables

Pointer and pointer variable:

The pointer is the address, and the address is the pointer.

The address is the memory unit number.

The pointer variable is the variable that stores the address.

Pointers and pointer variables are two different concepts.

We usually refer to pointer variables for short as pointers. Actually, they have different meanings.

Pointer importance:

Indicates some complex data structures

Fast data transfer

Returns more than one value to the function.

Direct access to hardware

Easy to process strings

Is the basis for understanding references in object-oriented languages.

Pointer definition:

The pointer is the address:

Memory Unit number

A non-zero integer starting from zero

Range: 4G (0 ~ 4G-1)

Pointer

The pointer variable stores the variable of the memory unit number in time, or the pointer variable is the variable that stores the address.

Pointers are essentially non-negative integers restricted by operations.

Pointer classification:

Basic Type pointer

Pointers and Arrays

Pointers and functions

Pointer and struct

Multilevel pointer