Function - C Programming MCQ Questions and Answers

1

In C, what is a function primarily used for?

A) Decision making B) Variable declaration C) Code organization and reusability D) Printing output

Discuss

Answer & Solution

Answer: Option C

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

2

What is the purpose of a function prototype in C?

A) To declare a function's return type B) To declare a function's name C) To declare a function's parameters and return type D) To declare a function's name and parameters

Discuss

Answer & Solution

Answer: Option D

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

3

What is the result of the expression sqrt(16) in C, assuming proper inclusion of the math library?

A) 4 B) 8 C) 2 D) Error

Discuss

Answer & Solution

Answer: Option A

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

4

In C, how are function arguments passed by default?

A) By value B) By reference C) By pointer D) By address

Discuss

Answer & Solution

Answer: Option A

Solution:

In the C programming language, function arguments are passed by value by default. This means that when you call a function and pass arguments to it, the function receives copies of the values of those arguments, rather than direct access to the original variables.

Here's a brief explanation of the other options:
Option B: By reference: In C, there is no direct reference concept as in languages like C++ or C#. Pass-by-reference is not the default behavior in C.
Option C: By pointer: While you can pass pointers as function arguments in C, it is not the default behavior. By default, the values themselves are passed.
Option D: By address: Passing by address is essentially the same as passing by pointer, and it is not the default behavior in C.
So, the correct answer is Option A: By value, as it describes the default behavior for passing function arguments in the C programming language.

5

What is the correct way to declare a function in C that takes no arguments and returns an integer?

A) int func(); B) func(int); C) func(); D) int func(int);

Discuss

Answer & Solution

Answer: Option C

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

6

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

A) To declare the function's return type B) To exit the program C) To return a value from the function D) To define a function

Discuss

Answer & Solution

Answer: Option C

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

7

Which of the following is not a standard C library function for mathematical operations?

A) pow B) rand C) sqrt D) abs

Discuss

Answer & Solution

Answer: Option B

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

8

What is the main advantage of using functions in C?

A) Reducing code redundancy and improving code organization B) Increasing program speed C) Eliminating the need for variables D) Reducing memory usage

Discuss

Answer & Solution

Answer: Option A

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

9

What is a function's return type in C if it does not return any value?

A) int B) void C) float D) char

Discuss

Answer & Solution

Answer: Option B

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

10

In C, what is a function parameter?

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

Discuss

Answer & Solution

Answer: Option A

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