Pointer suspension in C Language

Pointer floating

Pointers are easily overlooked when we use pointers. The main manifestation is: the memory pointed to by pointers.

Release, the pointer is not set to NULL, resulting in an uncontrollable pointer.

# Include

 
  
# Include

  
   
Int * pointer; void func () {int n = 8; pointer = & n; printf ("pointer point data is % d \ n", * pointer ); // pointer = NULL;} int main () {func (); sleep (2); printf ("% d \ n", * pointer); return 0 ;}

  

 

When the space is released, if this pointer is not set to NULL, the pointer will point to an unpredictable address. When it is set to NULL, a segment error (segment fault) will occur ), make us check for errors

Easy to use.