pointers

[anilk501]

what is dangaling pointers?

[smartway]

A dangling pointer is a pointer to storage that is no longer allocated.

[sowmyth]

uninitialised pointers are called dangling pointers/stray pointers.it is so dangerous that it may sometimes cause the system to crash.
i.e, instead of initialising a pointer like,
int *p;
we have to initialise it like ,
int *p=0;
or
int *p=NULL;

[Banfa]

int *p;
int *p=0;
int *p=NULL;

None of these stop the pointer "dangling", you write to any of these pointers and you are likely to get very undesireable behaviour.

These are effectively all uninitialise pointers but if you set the uninitialised pointer to o (or NULL) then you can at least detect it.

Before writing to the pointer you must initialise it

p = malloc(sizeof *p);