Stack and heap
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This document discusses the stack and heap in computer memory. The stack stores function calls and local variables, operates in LIFO order, and has a fixed size which can cause overflow errors if exceeded. The heap stores global variables and dynamically allocated memory using functions like malloc() and free(), has no size limits, but is slower to access. Examples show local variables stored on the stack while dynamically created objects go on the heap. The presentation aims to explain the differences between the stack and heap.
![STACK (contd..)
Example For Stack overflow
#include <stdio.h>
int main()
{
int nStack[100000000];
return 0;
}](https://image.slidesharecdn.com/stackandheap-131115225216-phpapp01/85/Stack-and-heap-8-320.jpg)
![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](https://image.slidesharecdn.com/stackandheap-131115225216-phpapp01/85/Stack-and-heap-10-320.jpg)
Stack and heap
- 2. Disclaimer: This presentation is prepared by trainees of baabtra as a part of mentoring program. This is not official document of baabtra –Mentoring Partner Baabtra-Mentoring Partner is the mentoring division of baabte System Technologies Pvt . Ltd
- 4. STACK & HEAP Swafeena Nima KM Swafeenanima @gmail.com www.facebook.com/ Swafeenanima twitter.com/username in.linkedin.com/in/ Swafeenanima 9562852057
- 5. STACK The stack is a common data structure for representing things Need to maintained in a particular order LIFO
- 6. 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
- 7. 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
- 8. STACK (contd..) Example For Stack overflow #include <stdio.h> int main() { int nStack[100000000]; return 0; }
- 9. 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
- 10. 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
- 11. STACK AND HEAP EXAMPLES public void Method1() { int i=4; int y=2; class1 cls1 = new class1(); }
- 12. STACK AND HEAP EXAMPLES (contd..)
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