What happens if a pointer is deleted?

The pointer itself does have an address and the value. The address of the pointer does not change after you perform delete on it. The space allocated to the pointer variable itself remains in place until your program releases it (which it might never do, e.g. when the pointer is in the static storage area).

What will be the output when we try to delete the pointer twice using delete operator in C++ code?

It is undefined behavior to call delete twice on a pointer. Anything can happen, the program may crash or produce nothing.

Can we delete the pointer in C?

No. delete will deallocate the memory to which its operand points. You must delete the same block of memory that you obtained from new .

Do pointers need to be deleted?

Pointers to variables on the stack do not need to be deleted. They become invalid on their own when the function the variable is in returns. Pointers to memory created using new should be deleted using delete .

Is pointer Nullptr after delete?

Setting pointers to NULL following delete is not universal good practice in C++. There are times when it is a good thing to do, and times when it is pointless and can hide errors. There are plenty of circumstances where it wouldn’t help. But in my experience, it can’t hurt.

What happens if you dont delete pointers?

This function allocates an integer dynamically, but never frees it using delete. Because pointers variables are just normal variables, when the function ends, ptr will go out of scope.

What happens if you delete a pointer twice?

If delete is applied to one of the pointers, then the object’s memory is returned to the free store. If we subsequently delete the second pointer, then the free store may be corrupted.

Do pointers need new?

The useful property of a pointer is that you only require a forward declaration of the pointed-to type (to actually use the object, you’ll need a definition).