C Library Functions MCQ Questions with Answers

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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What will the function rewind() do?

A Reposition the file pointer to a character reverse.
B Reposition the file pointer stream to end of file.
C Reposition the file pointer to begining of that line.
D Reposition the file pointer to begining of file.

Answer: Option D

Input/output function prototypes and macros are defined in which header file?

A conio.h
B stdlib.h
C stdio.h
D dos.h

Answer: Option C

Which standard library function will you use to find the last occurance of a character in a string in C?

A strnchar()
B strchar()
C strrchar()
D strrchr()

Answer: Option D

What is stderr ?

A standard error
B standard error types
C standard error streams
D standard error definitions

Answer: Option C

Does there any function exist to convert the int or float to a string?

A Yes
B No

Answer: Option A

What is the purpose of fflush() function.

A flushes all streams and specified streams.
B flushes only specified stream.
C flushes input/output buffer.
D flushes file buffer.

Answer: Option A

Can you use the fprintf() to display the output on the screen?

A Yes
B No

Answer: Option A

What will the function randomize() do in Turbo C under DOS?

A returns a random number.
B returns a random number generator in the specified range.
C returns a random number generator with a random value based on time.
D return a random number with a given seed value.

Answer: Option C

Which header file should be included to use functions like malloc() and calloc()?

A memory.h
B stdlib.h
C string.h
D dos.h

Answer: Option B

Q10

Which library function is used to read a string from standard input in C?

A scanf()
B gets()
C read()
D input()

Answer: Option B

Explanation: gets() function is used to read a string from standard input.

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C- Library Functions MCQ Questions and Answers

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