Stack and heap
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This document discusses the stack and heap in computer memory. It explains that the stack stores local variables and function calls using LIFO order, has fixed size, and can cause overflow. The heap stores global variables, has no dependencies between elements, is larger with no size limits, and is used for dynamic allocation with functions like malloc(). An example shows a variable allocated on the stack and one allocated on the heap via a class. Contact details are provided at the end.
![STACK (contd..)
Example For Stack overflow
#include <stdio.h>
int main()
{
int nStack[100000000];
return 0;
}](https://image.slidesharecdn.com/stackandheap-131115220118-phpapp02/85/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-131115220118-phpapp02/85/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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