Standard Library Functions MCQs

Question 1

Which standard library function is used to calculate the length of a string in C?

Accepted Answer

strlen()

Answer

strlength()

Answer

stringlen()

Answer

strsize()

Question 2

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

Accepted Answer

To print formatted text to the standard output

Answer

To read text from the standard input

Answer

To open a file

Answer

To close a file

Question 3

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

Accepted Answer

math.h

Answer

stdlib.h

Answer

cmath.h

Answer

algorithm.h

Question 4

What does the 'strcmp' function in C do?

Accepted Answer

Compares two strings and returns an integer indicating their relationship

Answer

Copies one string to another

Answer

Concatenates two strings

Answer

Searches for a substring

Question 5

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

Accepted Answer

To read formatted input from the standard input

Answer

To print text to the standard output

Answer

To open a file

Answer

To close a file

Question 6

Which function is used to convert a string to an integer in C?

Accepted Answer

atoi()

Answer

itoa()

Answer

str2int()

Answer

int2str()

Question 7

What is the return value of the 'rand' function in C?

Accepted Answer

A random integer

Answer

A float between 0 and 1

Answer

A character

Answer

A boolean value

Question 8

Which function is used to generate a random number in C?

Accepted Answer

rand()

Answer

random()

Answer

randomize()

Answer

generate_random()

Question 9

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

Accepted Answer

Converts a string to an integer

Answer

Converts an integer to a string

Answer

Copies a string

Answer

Searches for a substring