C Programming Memory Allocation Online Test, C Programming MCQ

C Programming Memory Allocation Online Test

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C Programming Memory Allocation Online Test. C Programming Question and Answers in English. C Programming Memory Allocation Online mock test paper is free for all students and Very Helpful for Exam Preparation. C Programming Memory Allocation Online Quiz. C Programming Online Mock test for Memory Allocation Topic. Here we are providing C Programming Memory Allocation Online Test Series in English. Check C Programming Mock Test Series 2021-2021.

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Question 1 of 23

1. Question
Which header file should be included to use functions like malloc() and calloc()?
- memory.h
- stdlib.h
- string.h
- dos.h
Correct

Incorrect
Question 2 of 23

2. Question
What function should be used to free the memory allocated by calloc() ?
- dealloc();
- malloc(variable_name, 0)
- free();
- memalloc(variable_name, 0)
Correct

Incorrect

Question 3 of 23

3. Question

How will you free the memory allocated by the following program?

#include<stdio.h>
#include<stdlib.h>
#define MAXROW 3
#define MAXCOL 4

int main()
{
    int **p, i, j;
    p = (int **) malloc(MAXROW * sizeof(int*));
    return 0;
}

memfree(int p);
dealloc(p);
malloc(p, 0);
free(p);

Correct

Incorrect

Question 4 of 23

4. Question
Specify the 2 library functions to dynamically allocate memory?
- malloc() and memalloc()
- alloc() and memalloc()
- malloc() and calloc()
- memalloc() and faralloc()
Correct

Incorrect

Question 5 of 23

5. Question

What will be the output of the program?

#include<stdio.h>
#include<stdlib.h>

int main()
{
    int *p;
    p = (int *)malloc(20); /* Assume p has address of 1314 */
    free(p);
    printf("%u", p);
    return 0;
}

1314
Garbage value
1316
Random address

Correct

Incorrect

Question 6 of 23

6. Question

What will be the output of the program (16-bit platform)?

#include<stdio.h>
#include<stdlib.h>

int main()
{
    int *p;
    p = (int *)malloc(20);
    printf("%d\n", sizeof(p));
    free(p);
    return 0;
}

4
2
8
Garbage value

Correct

Incorrect

Question 7 of 23

7. Question

What will be the output of the program?

include<stdio.h>
#include<string.h>

int main()
{#
    char *s;
    char *fun();
    s = fun();
    printf("%s\n", s);
    return 0;
}
char *fun()
{
    char buffer[30];
    strcpy(buffer, "RAM");
    return (buffer);
}

0xffff
Garbage value
0xffee
Error

Correct

The output is unpredictable since buffer is an auto array and will die when the control go back to main. Thus s will be pointing to an array , which not exists.

Incorrect

The output is unpredictable since buffer is an auto array and will die when the control go back to main. Thus s will be pointing to an array , which not exists.

Question 8 of 23

8. Question

What will be the output of the program?

#include<stdio.h>
#include<stdlib.h>

int main()
{
    union test
    {
        int i;
        float f;
        char c;
    };
    union test *t;
    t = (union test *)malloc(sizeof(union test));
    t->f = 10.10f;
    printf("%f", t->f);
    return 0;
}

10
Garbage value
10.100000
Error

Correct

Incorrect

Question 9 of 23

9. Question

Assume integer is 2 bytes wide. How many bytes will be allocated for the following code?

#include<stdio.h>
#include<stdlib.h>
#define MAXROW 3
#define MAXCOL 4

int main()
{
    int (*p)[MAXCOL];
    p = (int (*) [MAXCOL])malloc(MAXROW *sizeof(*p));
    return 0;
}

56 bytes
128 bytes
24 bytes
12 bytes

Correct

Incorrect

Question 10 of 23

10. Question

Assume integer is 2 bytes wide. What will be the output of the following code?

#include<stdio.h>
#include<stdlib.h>
#define MAXROW 3
#define MAXCOL 4

int main()
{
    int (*p)[MAXCOL];
    p = (int (*) [MAXCOL])malloc(MAXROW *sizeof(*p));
    printf("%d, %d\n", sizeof(p), sizeof(*p));
    return 0;
}

2, 8
4, 16
8, 24
16, 32

Correct

Incorrect

Question 11 of 23

11. Question
How many bytes of memory will the following code reserve?
#include<stdio.h> #include<stdlib.h> int main() { int *p; p = (int *)malloc(256 * 256); if(p == NULL) printf("Allocation failed"); return 0; }
- 65536
- Allocation failed
- Error
- No output
Correct

Hence 256*256 = 65536 is passed to malloc() function which can allocate upto 65535. So the memory allocation will be failed in 16 bit platform (Turbo C in DOS).

If you compile the same program in 32 bit platform like Linux (GCC Compiler) it may allocate the required memory.

Incorrect

Hence 256*256 = 65536 is passed to malloc() function which can allocate upto 65535. So the memory allocation will be failed in 16 bit platform (Turbo C in DOS).

If you compile the same program in 32 bit platform like Linux (GCC Compiler) it may allocate the required memory.
Question 12 of 23

12. Question
Point out the error in the following program.
#include<stdio.h> #include<stdlib.h> int main() { int *a[3]; a = (int*) malloc(sizeof(int)*3); free(a); return 0; }
- Error: unable to allocate memory
- Error: We cannot store address of allocated memory in a
- Error: unable to free memory
- No error
Correct

We should store the address in a[i]

Incorrect

We should store the address in a[i]
Question 13 of 23

13. Question
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; }
- Error: in strcpy() statement.
- Error: in *ptr = (char)malloc(30);
- Error: in free(ptr);
- No error
Correct

Answer: ptr = (char*)malloc(30);

Incorrect

Answer: ptr = (char*)malloc(30);
Question 14 of 23

14. Question
Which of the following statement is correct prototype of the malloc() function in c ?
- int* malloc(int);
- char* malloc(char);
- unsigned int* malloc(unsigned int);
- void* malloc(size_t);
Correct

Incorrect

Question 15 of 23

15. Question

Point out the correct statement which correctly free the memory pointed to by ‘s’ and ‘p’ in the following program?

#include<stdio.h>
#include<stdlib.h>

int main()
{
    struct ex
    {
        int i;
        float j;
        char *s
    };
    struct ex *p;
    p = (struct ex *)malloc(sizeof(struct ex));
    p->s = (char*)malloc(20);
    return 0;
}

free(p); , free(p->s);
free(p->s); , free(p);
free(p->s);
free(p);

Correct

Incorrect

Question 16 of 23

16. Question

Point out the correct statement which correctly allocates memory dynamically for 2D array following program?

#include<stdio.h>
#include<stdlib.h>

int main()
{
    int *p, i, j;
    /* Add statement here */
    for(i=0; i<3; i++)
    {
        for(j=0; j<4; j++)
        {
            p[i*4+j] = i;
            printf("%d", p[i*4+j]);
        }
    }
    return 0;
}

p = (int*) malloc(3, 4);
p = (int*) malloc(3*sizeof(int));
p = malloc(3*4*sizeof(int));
p = (int*) malloc(3*4*sizeof(int));

Correct

Incorrect

Question 17 of 23

17. Question
malloc() returns a float pointer if memory is allocated for storing float‘s and a double pointer if memory is allocated for storing double‘s.
- True
- False
Correct

Incorrect
Question 18 of 23

18. Question
malloc() allocates memory from the heap and not from the stack.
- True
- False
Correct

Incorrect
Question 19 of 23

19. Question
malloc() returns a NULL if it fails to allocate the requested memory.
- True
- False
Correct

Incorrect
Question 20 of 23

20. Question
If malloc() successfully allocates memory it returns the number of bytes it has allocated.
- True
- False
Correct

Syntax: void *malloc(size_t size);

The malloc() function shall allocate unused space for an object whose size in bytes is specified by size and whose value is unspecified.

The order and contiguity of storage allocated by successive calls to malloc() is unspecified. The pointer returned if the allocation succeeds shall be suitably aligned so that it may be assigned to a pointer to any type of object and then used to access such an object in the space allocated (until the space is explicitly freed or reallocated). Each such allocation shall yield a pointer to an object disjoint from any other object. The pointer returned points to the start (lowest byte address) of the allocated space. If the space cannot be allocated, a null pointer shall be returned. If the size of the space requested is 0, the behavior is implementation-defined: the value returned shall be either a null pointer or a unique pointer.

Incorrect

Syntax: void *malloc(size_t size);

The malloc() function shall allocate unused space for an object whose size in bytes is specified by size and whose value is unspecified.

The order and contiguity of storage allocated by successive calls to malloc() is unspecified. The pointer returned if the allocation succeeds shall be suitably aligned so that it may be assigned to a pointer to any type of object and then used to access such an object in the space allocated (until the space is explicitly freed or reallocated). Each such allocation shall yield a pointer to an object disjoint from any other object. The pointer returned points to the start (lowest byte address) of the allocated space. If the space cannot be allocated, a null pointer shall be returned. If the size of the space requested is 0, the behavior is implementation-defined: the value returned shall be either a null pointer or a unique pointer.
Question 21 of 23

21. Question
Can I increase the size of dynamically allocated array?
- Yes
- No
Correct

Use realloc(variable_name, value);

Incorrect

Use realloc(variable_name, value);
Question 22 of 23

22. Question
Can I increase the size of statically allocated array?
- Yes
- No
Correct

Incorrect
Question 23 of 23

23. Question
When we dynamically allocate memory is there any way to free memory during run time?
- Yes
- No
Correct

Using free()

Incorrect

Using free()