Welcome to the Library Functions MCQs Page

Dive deep into the fascinating world of Library Functions with our comprehensive set of Multiple-Choice Questions (MCQs). This page is dedicated to exploring the fundamental concepts and intricacies of Library Functions, a crucial aspect of C Programming. In this section, you will encounter a diverse range of MCQs that cover various aspects of Library Functions, from the basic principles to advanced topics. Each question is thoughtfully crafted to challenge your knowledge and deepen your understanding of this critical subcategory within C Programming.

Check out the MCQs below to embark on an enriching journey through Library Functions. Test your knowledge, expand your horizons, and solidify your grasp on this vital area of C Programming.

Note: Each MCQ comes with multiple answer choices. Select the most appropriate option and test your understanding of Library Functions. You can click on an option to test your knowledge before viewing the solution for a MCQ. Happy learning!

Library Functions MCQs | Page 10 of 13

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10

Macro and Preprocessor

Q91.

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);

Discuss

Answer: (d).void* malloc(size_t);

Q92.

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);

Discuss

Answer: (b).free(p->s); , free(p);

Q93.

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));

Discuss

Answer: (d).p = (int*) malloc(3*4*sizeof(int));

Q94.

What is the return type of malloc() or calloc()?

int *

int **

void *

void **

Discuss

Answer: (c).void *

Q95.

Which function is used to delete the allocated memory space?

Dealloc()

free()

both a and b

None of the above

Discuss

Answer: (b).free()

Q96.

Among 4 header files, which should be included to use the memory allocation functions like malloc(), calloc(), realloc() and free()?

#include<string.h>

#include<stdlib.h>

#include<memory.h>

Both b and c

Discuss

Answer: (b).#include<stdlib.h>

Q97.

Which of the following is/are true?

calloc() allocates the memory and also initializes the allocates memory to zero, while memory allocated using malloc() has random data.

malloc() and memset() can be used to get the same effect as calloc()

Both malloc() and calloc() return 'void *' pointer

All of the above

Discuss

Answer: (d).All of the above

Q98.

Which languages necessarily need heap allocation in the run time environment?

Those that support recursion

Those that use dynamic scoping

Those that use global variables

Those that allow dynamic data structures

Discuss

Answer: (d).Those that allow dynamic data structures

Q99.

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

May be True or False

Can't Say

Discuss

Answer: (b).False

Q100.

malloc() allocates memory from the heap and not from the stack.

True

False

May be True or False

Can't Say

Discuss

Answer: (a).True

Page 10 of 13

Welcome to the Library Functions MCQs Page

Library Functions MCQs | Page 10 of 13

Explore more Topics under C Programming

C Programming Fundamentals

Data Types,Operators and Expressions in C

Control Flow Statements in C

Functions

Pointers and Arrays in C

Structures and Unions

Input and Output in C

Strings

File Handling in C

Macro and Preprocessor

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