Standard Library Functions MCQs

Question 1

Which library should be included to use the 'sin' function in C?

Accepted Answer

math.h

Answer

stdlib.h

Answer

cmath.h

Answer

algorithm.h

Question 2

What does the 'fgets' function in C do?

Accepted Answer

Reads a line of text from a file

Answer

Reads a single character from the standard input

Answer

Compares two strings

Answer

Converts a string to an integer

Question 3

Which function is used to open a file in C?

Accepted Answer

fopen()

Answer

openfile()

Answer

readfile()

Answer

closefile()

Question 4

What is the purpose of the 'abs' function in C?

Accepted Answer

To calculate the absolute value of an integer

Answer

To find the maximum value in an array

Answer

To convert a string to lowercase

Answer

To calculate the square root of a number

Question 5

Which standard library function is used to clear the standard input buffer in C?

Accepted Answer

fflush()

Answer

clearbuffer()

Answer

clearinput()

Answer

clrscr()

Question 6

What does the 'strcpy' function in C do?

Accepted Answer

Copies one string to another

Answer

Compares two strings

Answer

Searches for a substring

Answer

Concatenates two strings

Question 7

Which function is used to find the smallest integer greater than or equal to a given floating-point number in C?

Accepted Answer

ceil()

Answer

floor()

Answer

round()

Answer

nextint()

Question 8

What is the purpose of the 'strcpy' function in C?

Accepted Answer

Copies one string to another

Answer

Compares two strings

Answer

Searches for a substring

Answer

Converts a string to an integer

Question 9

Which library should be included to use the 'pow' function in C?

Accepted Answer

math.h

Answer

stdio.h

Answer

cmath.h

Answer

algorithm.h