Wild pointer understanding

The position of the pointer is unknown （ Random 、 incorrect 、 There is no definite limit to ）

The cause of the wild pointer

1. Pointer not initialized

2 Pointer cross boundary access

3  The space that the pointer points to is released

 

  How to avoid wild pointer

1. Pointer initialization

2. Watch out for the pointer

3. Pointer to space release even if set to NULL

4. Avoid returning the address of a local variable

5. Check the validity of the pointer before using it