Stack Vs Heap: Know The Difference

Stack and Heap are both are used for the memory allocation, but different uses stack used for the static memory allocation and Heap used for the dynamic memory allocation but both stored in the computer RAM

in the article, you get all detailed information of the Stack and Heap, and at the end, you know the difference between the Stack and Heap

What is a Stack?

In the computer, there is a particular area present in that the temporary variables are stored.

in the Stack, variables are declared in the runtime and stored also

you can say only its temporary storage memory after the finish your work or task they automatically erased

The Stack mainly contains the methods and variables.

The Stack is the memory set aside as scratch space for a thread of execution.

A function called, a block reserved on the top of the Stack for local variables and some bookkeeping data.

When that function returns, the block becomes unused and can use the next time a process called.

The Stack is always reserve in a LIFO (last in first out) order; the most recently reserved block is still the next block to be freed.

It makes it simple to keep track of the Stack; freeing a block from the Stack is nothing more than adjusting one pointer.

What is Heap?

Heap is such a type of computer memory the data store globally, or you can say global variable.

All the global variables are store in the heap memory process.

The heap is memory set aside for dynamic allocation.

Contrary to the Stack, there is no enforced pattern into the allocation and deallocation of cubes In the Heap; you could devote a block and free it at any moment.

It makes it much more complex to keep track of which parts of the heap are allocated or free at any given time; many custom heap allocators are available to tune heap performance for different usage patterns.

Difference between stack and heap




Type of data structures A stack is a linear data structure. Heap is a hierarchical data structure.
Access time Faster Slower
Flexibility Fixed-size Resizing is possible
Locality of reference Automatic compile-time instructions. Adequate
Main Issue Shortage of memory Memory fragmentation
Implementation A stack can be implemented in 3 ways simple array-based, using dynamic memory, and Linked list based. Heap can be implemented using array and trees.
Cost Less More
Deallocation Does not require de-allocate variables. Explicit de-allocation is needed.
Allocation and Deallocation Automatically done by compiler instructions. It is manually done by the programmer.
Memory Allocation Memory is allocated in a contiguous block. Memory is allocated in any random order.
Limit of space size Limit on stack size dependent on OS. Does not have a specific limit on memory size.
Space management Space managed efficiently by OS so memory will

Never become fragmented.

Heap Space not used as efficiently. Memory can become fragmented as blocks of memory first allocated and then freed.


Advantages of using Stack

Stack helps you manage the data last in first out (LIFO) method, and it is not possible in the linked list and array.

stack you use than it’s not easily corrupted

commonly Stack is used when a variable is not used outside the function

it allows you to hoe memory allocated and deallocated

Advantages of using Heap

Heap is helped you to find the most incredible and minimum number.

this method is used in the priority queue

it also allows you to access variables globally

its significant advantages are the does not have any limit on memory size

When to use the Heap or Stack?

heap and Stack are both are used in a different time and for the other uses

Heap is using when you need to allocate a large block of memory.

the Stack is used when you are working with small variables

Critical differences between Stack and Heap

In a stack, the designation and deallocation are naturally done while, in a pile, it should be finished by the developer physically.

Treatment of Heap outline is costlier than the treatment of the stack outline.

Memory deficiency issue is bound to occur in Stack through the primary point in load memory is a fracture.

Stack outline access is more straightforward than the load outline as the Stack has a little area of memory and is reserve agreeable. Yet, in the event of store outlines which are scattered all through the memory, so it causes more reserve misses.

A stack isn’t adaptable, the memory size apportioned can’t be changed through a store is adjustable, and the assigned memory can be modified.

Getting to the season of the store takes is more than a stack.


Stack Vs Heap are both are different terms, and they have both temporary uses for other purposes you can use this all of Stack and Heap.

All detailed information with the difference is given in this article and the meaning of Stack and Heap.

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