C Library Functions MCQ Questions with Answers | Page 3

C Library Functions MCQ questions with answers focus on standard C functions like printf(), scanf(), strlen(), strcmp(), and malloc(). These programming questions and answers test how well students understand the C Standard Library and its functions. Practicing programming MCQ with explanations is essential for placement exams and programming interviews in companies like Wipro, Cognizant, and TCS. By revising library functions through C programming test practice online, learners can enhance their coding accuracy and logical thinking, ensuring success in both academic exams and technical interviews.

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Q21

What does calloc() initialize the allocated memory to?

A Garbage value
B Zero
C One
D NULL

Answer: Option B

Explanation: calloc() initializes allocated memory to zero.

Q22

Which function is used to write formatted output to string?

A printf()
B fprintf()
C sprintf()
D format()

Answer: Option C

Explanation: sprintf() writes formatted output to a string.

Q23

What is the return type of sizeof operator?

A int
B unsigned int
C size_t
D long int

Answer: Option C

Explanation: sizeof returns size_t which is unsigned integer type.

Q24

Which function searches for a character in a string?

A strstr()
B strchr()
C strfind()
D search()

Answer: Option B

Explanation: strchr() searches for first occurrence of character in string.

Q25

What does realloc() function do?

A Allocate new memory
B Deallocate memory
C Change size of allocated memory
D Initialize memory

Answer: Option C

Explanation: realloc() changes size of previously allocated memory block.

Q26

Which function is used to close a file in C?

A close()
B fclose()
C fileclose()
D endfile()

Answer: Option B

Explanation: fclose() is used to close an opened file.

Q27

What does the floor() function return?

A Smallest integer >= argument
B Largest integer <= argument
C Rounded value
D Absolute value

Answer: Option B

Explanation: floor() returns largest integer less than or equal to argument.

Q28

Which function is used to concatenate two strings?

A strconcat()
B concat()
C strcat()
D strjoin()

Answer: Option C

Explanation: strcat() appends source string to destination string.

Q29

What is the purpose of fflush() function?

A Clear input buffer
B Flush output buffer
C Fill buffer
D Delete buffer

Answer: Option B

Explanation: fflush() flushes the output buffer of a stream.

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C- Library Functions MCQ Questions and Answers

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