Standard Library Functions - C Programming MCQ Questions and Answers

1

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

A) strlen() B) strlength() C) stringlen() D) strsize()

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Answer & Solution

Answer: Option A

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2

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

A) To print formatted text to the standard output B) To read text from the standard input C) To open a file D) To close a file

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Answer & Solution

Answer: Option A

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3

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

A) math.h B) stdlib.h C) cmath.h D) algorithm.h

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Answer & Solution

Answer: Option A

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4

What does the 'strcmp' function in C do?

A) Compares two strings and returns an integer indicating their relationship B) Copies one string to another C) Concatenates two strings D) Searches for a substring

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Answer & Solution

Answer: Option A

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5

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

A) To read formatted input from the standard input B) To print text to the standard output C) To open a file D) To close a file

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Answer & Solution

Answer: Option A

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6

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

A) atoi() B) itoa() C) str2int() D) int2str()

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Answer & Solution

Answer: Option A

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7

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

A) A random integer B) A float between 0 and 1 C) A character D) A boolean value

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Answer & Solution

Answer: Option A

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8

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

A) rand() B) random() C) randomize() D) generate_random()

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Answer & Solution

Answer: Option A

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9

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

A) Converts a string to an integer B) Converts an integer to a string C) Copies a string D) Searches for a substring

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Answer & Solution

Answer: Option A

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10

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

A) math.h B) stdlib.h C) cmath.h D) algorithm.h

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Answer & Solution

Answer: Option A

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