int main() { int *p=new int; *p=10; del p;

int main()
{
int *p=new int;
*p=10;
del p;
cout<<*p;
*p= 60;
cout<<*p;
}
what will be the output & why?

Question Posted / sa

4 Answers
12618 Views
TCS, I also Faced
E-Mail Answers

Answers were Sorted based on User's Feedback

int main() { int *p=new int; *p=10; del p; cout<<*p; ..

Answer / sethuu

First output will print some garbage value because you
delete the object p and the you print.

The second one will print value 60.

Is This Answer Correct ?

11 Yes

3 No

int main() { int *p=new int; *p=10; del p; cout<<*p; ..

Answer / jaroosh

There will be an error because its "del" instead of "delete".
In this particular program, you might actually get away with
using p after delete, but lets look what happens here :

int *p=new int;
*p=10;
cout << "ADDRESS OF P is " << p << endl;
delete p;
int * x= new int(3);
cout << "ADDRESS OF X=" << *x << " is " << x << endl;
*p = 10; //We think we got away with deleting p so why not
//still use it!
cout << "VALUE OF X : " << *x; //Here is why...

now, though its basically a policy of compiler, here is what
probably WILL happen in the output (memory addresses are
exemplary):
ADDRESS OF P is 0x272740
ADDRESS OF X=3 is 0x272740
VALUE OF X : 10
Now this is totally NOT what we would like our program to
do, and this is because though delete WILL mostly call
objects destructors and sometimes even clear memory, but p
is STILL pointing to that location, to which compiler
assumes it is safe to allocate variable x!
So now we end up having ONE memory storage and two pointers
p and x pointing to it.
This is why though it will not crash your compilation and
probably you can get away with no runtime errors, this leads
to serious troubles and as a rule NEVER use pointers after
you deleted their storage.

Is This Answer Correct ?

7 Yes

1 No

int main() { int *p=new int; *p=10; del p; cout<<*p; ..

Answer / hemang

There will be error because del is used instead of delete. in c++ delete is the keyword not del. delete is used to delete an object.

So program will not run....

Is This Answer Correct ?

6 Yes

0 No

int main() { int *p=new int; *p=10; del p; cout<<*p; ..

Answer / anu

I think error will come bcoz memory allocated to *P is
already deleted d it will point to nowhere now....

Is This Answer Correct ?

3 Yes

5 No

Post New Answer