stack and heap

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STACK & HEAP

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STACK

The stack is a common data structure for representing things

Need to maintained in a particular order

LIFO

STACK (contd..)

Local variables are stored on the stack

Stores temporary variables created by each function

Often a function or method calls another function which in turn

calls another function etc

STACK (contd..)

The stack has a fixed size

Both stack and heap are store on the RAM

If there is not enough space on the stack to handle the

memory being assigned to it, a stack overflow occurs

STACK (contd..)

Example For Stack overflow

#include <stdio.h>

int main()

{

int nStack[100000000];

return 0;

}

HEAP

The heap is simply the memory used by programs to store

global variables

Heap variables have no dependencies with each other and

can always be accessed randomly at any time

Used for dynamic memory allocation

HEAP (contd..)

It is a more free-floating region of memory (and is larger)

To allocate memory malloc() , calloc() or realloc()

To deallocate memory free() [Memory leak]

Does not have size restrictions on variable size

Heap memory is slightly slower to be read from and written to

STACK AND HEAP EXAMPLES

public void Method1()

{

int i=4;

int y=2;

class1 cls1 = new class1();

}

STACK AND HEAP EXAMPLES (contd..)

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