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

3. Typing Speed
Week
Target Achieved
1
21
19
2
24
21
3
25
22
4
25
23

4. Jobs Applied
#
Company
Designation
Applied Date
1
cs3Infomat Pvt. Ltd
Software trainee
13-9-2013
2
Big leap
Web designers
17-9-2013
3
Current Status

5. Stack & heap memory
Waseem hassan
wazeeem456@gmail.com
www.facebook.com/waseem
hassan
twitter.com/username
in.linkedin.com/in/waseemh
assan
9567850028

6. Stack
• The stack is a place in the computer memory
where all the variables that are declared and
initialized before runtime are stored.
• It is a temporary storage memory, if you come
out of the program the memory of the
variable will not be there.
• Any data on the stack for a function will
automatically be deleted.

7. stack
• In stack , data is added or removed in Last-infirst-out manner(LIFO)

8. stack
• The stack has a fixed size
• Both stack and heap are stored on the RAM
• If there is not enough space on the stack to
handle the memory being assigned to it, a
stack overflow occurs.

9. Example-stack overflow
• Example For Stack overflow
#include <stdio.h>
int main()
{
int nStack[100000000];
return 0;
}
• Causes stack overflow
• Program will crash

10. Heap
• Heap is an area of memory used for dynamic
memory allocation.
• The heap is the memory used by program to
store global variables.
• Variables on the heap must be destroyed
manually.

11. Heap
• Any data on the heap will remain there until
it’s manually deleted by the programmer.
• If the current size of the heap is too small to
accommodate new memory, then more
memory can be added to the heap by the
operating system.

12. Heap
• To allocate memory – malloc(),calloc() or
realloc()
• To deallocate memory-free()[memory leak]
• Does not have size restrictions on variable size
• Heap memory is slower than stack

13. Example:malloc(),realloc(),free()
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#include <stdio.h>
#include <stdlib.h>
int main()
{
char *str;
/* Initial memory allocation */
str = (char *) malloc(15);
strcpy(str, “ABC");
printf("String = %s, Address = %un", str, str);
/* Reallocating memory */
str = (char *) realloc(str, 25);
strcat(str, ".com");
printf("String = %s, Address = %un", str, str);
free(str);
return(0);
}

14. Example : stack and heap
public void Method1()
{
int i=4;
int y=2;
class1 cls1 = new class1();
}

15. Example : stack and heap

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