Pointer related concepts

What is the pointer ？

1. A pointer is the number of the smallest cell in memory , That's the address

2. The pointer in spoken English , Usually refers to pointer variables , Is a variable used to store the memory address

summary ： The pointer is the address , Colloquially speaking, pointer usually refers to pointer variable .

  Pointer to the variable

We can go through &（ Take the address operator ） Get the real memory address of the variable , The address can be stored in a variable , This A variable is a pointer variable

Pointer types  

int Type a pointer , Operable four bytes

 

  The type of pointer determines Pointer dereference operation , The size of the space that can be accessed （ Can manipulate a few bytes ）

such as ： char* Only one byte can be accessed by dereferencing the pointer of , and int* Four bytes can be accessed by dereferencing the pointer of .

Pointers add and subtract integers   The type of pointer determines how big the pointer moves forward or backward （ distance , byte ）.