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. Week Target Achieved
1 30 20
2
3
Typing Speed

4. Functions with heap and
stack
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5. Stack
• special region of our computer's memory that
stores temporary variables created by each
function (including the main() function)
• "FILO" (first in, last out) data structure-
managed by CPU
• Every time a function declares a new variable-
pushed &popped

6. Stack (conti)
• variables are allocated and freed
automatically
• stack has size limits
• stack variables are local in nature
• stack variables is very fast
• variables cannot be resized

7. Example
#include <stdio.h>
double multiplyByTwo (double input) {
double twice = input * 2.0;
return twice;
}
int main (int argc, char *argv[])
{
int age = 30;
double salary = 12345.67;
printf("double your salary is %.3fn", multiplyByTwo(salary));
return 0;
}
output
double your salary is 24691.340

8. Heap
• region of our computer's memory that is not
managed automatically
• To allocate memory - malloc() or calloc()
• To delete memory – free()
• Memory leak

9. Heap(conti)
• variables can be accessed globally
• no limit on memory size
• (relatively) slower access
• you must manage memory (you're in charge
of allocating and freeing variables)
• variables can be resized using realloc()

10. Example
#include <stdio.h>
#include <stdlib.h>
double *multiplyByTwo (double *input) {
double *twice = malloc(sizeof(double));
*twice = *input * 2.0;
return twice;
}
int main (int argc, char *argv[])
{
int *age = malloc(sizeof(int));
*age = 30;
double *salary = malloc(sizeof(double));
*salary = 12345.67;
double *twiceSalary = multiplyByTwo(salary);
printf("double your salary is %.3fn", *twiceSalary);
free(age);
free(salary);
free(twiceSalary);
return 0;
}

11. When to use the Heap?
• you are dealing with relatively small variables
–stack
• you need to allocate a large block of memory
- heap

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