C Programming Memory Allocation MCQ

21. Consider the following program, where are i, j and k are stored in memory?

#include <stdio.h>
#include  <stdlib.h>
int i;
int main()
{
     int j;
    int *k = (int *) malloc (sizeof(int));
}

A. i, j and *k are stored in stack segment
B. i and j are stored in stack segment. *k is stored on heap.
C. i is stored in BSS part of data segment, j is stored in stack segment. *k is stored on heap.
D. j is stored in BSS part of data segment, i is stored in stack segment. *k is stored on heap.

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22. What function should be used to free the memory allocated by calloc() ?

A. dealloc();
B. malloc(variable_name, 0)
C. free();
D. memalloc(variable_name, 0)

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23. Point out the error in the following program.

#include <stdio.h>
#include  <stdlib.h>
int main()
{
    char *ptr;
    *ptr = (char)malloc(30);
    strcpy(ptr, "RAM");
    printf("%s", ptr);
    free(ptr);
    return 0;
}

A. Error: in strcpy() statement
B. Error: in *ptr = (char)malloc(30);
C. Error: in free(ptr);
D. No Error

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24. Where does the uninitialized data gets stored in memory?

A. Code segment
B. Data segment
C. BSS- Block started by symbol
D. Heap

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25. malloc() returns a NULL if it fails to allocate the requested memory.

A. TRUE
B. FALSE
C. May Be
D. Can't Say

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26. If malloc() successfully allocates memory it returns the number of bytes it has allocated.

A. TRUE
B. FALSE
C. May Be
D. Can't Say

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27. Can I increase the size of dynamically allocated array?

A. Yes
B. No
C. May Be
D. Can't Say

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28. Can we increase the size of statically allocated array?

A. Yes
B. No
C. May Be
D. Can't Say

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29. When we dynamically allocate memory is there any way to free memory during run time?

A. Yes
B. No
C. May Be
D. Can't Say

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30. What is the output of this program?

#include <stdio.h>
#include  <stdlib.h>
int main()
{
 struct test
 {
   int i;
   float f;
   char c;
 };
 struct test *ptr;
 ptr = (struct test *)malloc(sizeof(struct test));
 ptr ->f = 5.5f;
 printf("%f", ptr->f);
 return 0;
}

A. 5.5
B. 5
C. 5.5
D. 0

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