Difference between Stack and Heap ?



Difference between Stack and Heap ?


Stack Heap
Stack has very fast to access. Heap has slower to access while compared to stack.
Limit on stack size depends
on OS.
No limit on memory size.
Stack variables cannot be resized. Heap variables can be resized using realloc() method.
In Stack,space is managed efficiently by CPU,
memory will not become fragmented.
There is no guaranteed efficient use of space, memory may become fragented over time as blocks of memory are allocated, then freed.
Manage memory during allocating and freeing variables. Don't have to explicitly de-allocate variables.
Stack to accessed only local variables. Heap variables can be accessed globally.
Stack memory is used only by
one thread of execution.
Heap memory is used by all the parts of the application
The stack is always reserved
in a LIFO order, the most recently reserved block
is always the next block to be freed.
Element of the heap have no dependencies with each other and can always be accessed randomly at any time.
 Difference Between Stack and Heap


Difference Between Stack and Heap



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