Sunday, January 1, 2012

What IsDangling Pointer ?

DAnging Pointer :::::::
If any pointer is pointing the memory address of any variable , but after sometime the variable is deleted  while the pointer is still pointing such memory location. Such pointer is known as dangling pointer .


e.g :


int *call();
void main(){

int *ptr;


int * call(){

int x=25;

return &x;

Output :::::
 Garbage Value

variable x is local variable. Its scope and lifetime is within the function call hence after returning address of x variable x became dead and pointer is still pointing ptr is still pointing to that location.

No comments:

Post a Comment