Memory allocated with new int[10] must be deallocated with delete[]

Question

Statement:

Memory allocated with new int[10] must be deallocated with delete[].

So..

new int[10];

Then how do I delete it?

EDIT: Thank you guys :) I think Wilson, Paul, Tim etc. are right, the statement omit some words therefore confused me - -...it's simply

int * p = new int[10];

delete [] p;

I've never seen Rob's answer though, looks really new to me! Any explanation will be appreciated.:)

delete[] new int[10];

You should use `std::vector`. I don't remember when I wrote `delete` or `delete []` last time in code. — Naszta, Feb 27 '13 at 20:58
Perhaps not an exact duplicate, but worth a link: http://stackoverflow.com/questions/2486034/delete-an-array-of-objects — jogojapan, Feb 27 '13 at 21:03

score 6 · Accepted Answer · answered Feb 27 '13 at 20:54

You're missing a variable to hold the value returned from new. You should have something like:

int* intArray = new int[10];

then later when you want to delete the memory, you reference it through the variable:

delete[] intArray;

score 1 · Answer 2 · answered Feb 27 '13 at 20:54

1

Just like it says:

int *foo = new int[10];
delete[] foo;

answered Feb 27 '13 at 20:54

Tim

if I will not delete any memory and program exits. Then there could be any risk? ( Mean we just need to delete memory on run time? ) – Asif Mushtaq Aug 02 '15 at 20:34

score 1 · Answer 3 · answered Feb 27 '13 at 20:54

1

int * p = new int[10]; // allocate p

// do stuff with p

delete [] p;           // release p when you're done

answered Feb 27 '13 at 20:54

Paul R

if I will not delete any memory and program exits. Then there could be any risk? Someone told me that if we will not deallocate the memory and program exit, then that memory will unusable until operator system reinstalled. – Asif Mushtaq Aug 02 '15 at 20:35
Most modern operating systems will clean up remaining memory allocations on program exit, but it's a good idea to free all dynamic allocations anyway - it makes it easier to find memory leaks and it may become important if the program is re-architected. – Paul R Aug 02 '15 at 21:47
What do you mean when you say "clear/clean the memory" ? – Paul R Aug 03 '15 at 05:02

3 Answers3