Wisdom Podcast Video Learning---->>>> wild pointer causes and avoidance methods

The reason why the wild pointer is produced:

1, the pointer variable and the memory space variable that he points to are two different concepts

2, although the call to the free (p) method frees the memory space pointed to by the pointer, but the pointer variable is not reset to null

3, resulting in the freed of the pointed memory space, the use if (p! = NULL) is also executed, and the free () method is executed

Avoidance methods:

1, when the pointer is defined, initializes its value to null (char *p = null;)

2, after releasing the memory space pointed to by the pointer, reset the pointer to NULL

　　　

1     ······ 2 3 char *p = NULL; 4 5     ······ 6 7 if (P! = NULL) {  8free    (p); 9     p = NULL;            Ten }     

Wisdom Podcast Video Learning---->>>> wild pointer Generation and avoidance methods