Function - C Programming MCQ Questions and Answers

21

In C, what is the purpose of the 'inline' keyword when used with a function?

A) To indicate that the function should be inlined by the compiler B) To specify that the function is only used in one file C) To make the function public D) To declare a recursive function

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Answer & Solution

Answer: Option A

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22

What is a function parameter in C?

A) A value passed to a function when it's called B) A variable declared within a function C) A reserved keyword D) A global variable

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Answer & Solution

Answer: Option A

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23

What is the result of the expression ceil(3.2) in C, assuming proper inclusion of the math library?

A) 3 B) 4 C) 0.2 D) Error

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Answer & Solution

Answer: Option B

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24

In C, what is the purpose of the 'const' keyword when used with a function parameter?

A) It specifies that the parameter is constant and cannot be modified B) It makes the parameter mandatory C) It makes the parameter optional D) It specifies that the parameter is a constant function

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Answer & Solution

Answer: Option A

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25

How can you declare a function in C that takes a variable number of arguments?

A) Using the 'variable' keyword B) Using the 'args' keyword C) Using the '...' notation D) Using the 'varargs' keyword

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Answer & Solution

Answer: Option C

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26

In C, what is the purpose of the 'recursion' in a function?

A) To create an infinite loop B) To make the function faster C) To make the function return a constant value D) To call the function itself

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Answer & Solution

Answer: Option D

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27

What is the result of the expression pow(2, 3) in C, assuming proper inclusion of the math library?

A) 5 B) 6 C) 8 D) Error

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Answer & Solution

Answer: Option C

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28

What is the purpose of the 'volatile' keyword when used with a function in C?

A) To make the function execute faster B) To specify that the function is unpredictable C) To optimize the function D) To indicate that the function may change external variables

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Answer & Solution

Answer: Option D

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29

What is the result of the expression abs(-7.5) in C?

A) -7.5 B) 7.5 C) 7 D) Error

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Answer & Solution

Answer: Option D

Solution:

In C, the function abs() is defined in stdlib.h and is used to compute the absolute value of an integer.

Passing a floating-point number like -7.5 to abs() is incorrect because abs() expects an int argument.

To handle floating-point numbers, C provides a different function called fabs(), which is defined in math.h.

Therefore, using abs(-7.5) results in a compile-time error or unexpected behavior because the argument type does not match the function's expected parameter.

Option A and B are incorrect because abs() cannot legally process a float.

Option C is incorrect because while 7 is the integer part, the input is still a float and would not be accepted by abs().

Hence, the correct answer is Option D: Error.

30

In C, what is a function parameter's scope?

A) Limited to the function where it is declared B) Limited to the entire program C) Limited to the block where it is declared D) Limited to the main() function

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Answer & Solution

Answer: Option A

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