Standard Library Functions - C Programming MCQ Questions and Answers

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Each section contains 100 MCQs on Standard Library Functions .

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

A) Converts a character to lowercase B) Converts a character to uppercase C) Removes leading spaces from a string D) Converts a string to lowercase

Discuss

Answer & Solution

Answer: Option A

No explanation is given for this question. Let's Discuss on Board

Which function is used to close a file in C?

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

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Answer & Solution

Answer: Option A

No explanation is given for this question. Let's Discuss on Board

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

A) The character read from the standard input B) A random integer C) -1 D) 0

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Answer & Solution

Answer: Option A

No explanation is given for this question. Let's Discuss on Board

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

No explanation is given for this question. Let's Discuss on Board

What does the 'getch' function in C do?

A) Reads a character from the standard input without echoing B) Reads a character from the standard input with echoing C) Copies one string to another D) Compares two strings

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Answer & Solution

Answer: Option A

No explanation is given for this question. Let's Discuss on Board

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

A) Converts a character to uppercase B) Converts a character to lowercase C) Removes trailing spaces from a string D) Converts a string to uppercase

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Answer & Solution

Answer: Option A

No explanation is given for this question. Let's Discuss on Board

Which function is used to find the square root of a number in C?

A) sqrt() B) sqrtr() C) sqrtroot() D) squareroot()

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Answer & Solution

Answer: Option A

No explanation is given for this question. Let's Discuss on Board

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

A) Checks if a character is alphabetic B) Checks if a character is numeric C) Checks if a character is a special character D) Checks if a character is uppercase

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Answer & Solution

Answer: Option A

No explanation is given for this question. Let's Discuss on Board

Which standard library function is used to open a file in C?

A) fopen() B) openfile() C) readfile() D) closefile()

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Answer & Solution

Answer: Option A

No explanation is given for this question. Let's Discuss on Board

What does the 'abs' function in C do?

A) Calculates the absolute value of an integer B) Finds the maximum value in an array C) Converts a string to lowercase D) Calculates the square root of a number

Discuss

Answer & Solution

Answer: Option A

No explanation is given for this question. Let's Discuss on Board

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