Functions and Procedures in C++ MCQ question and answer with solution

11

What is the output of the following code: int square(int x) { return x * x; } int main() { cout << square(3) + square(2); } in C++?

A) 13 B) 25 C) 12 D) Compilation error due to mismatched return types

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Answer & Solution

Answer: Option A

Solution:

The given code defines a function named square which takes an integer x as input and returns the square of x. In the main function, square(3) returns 9 and square(2) returns 4. When these values are added together and printed, the output will be 9 + 4 = 13.

12

What is the correct syntax for defining a recursive function in C++?

A) returnType functionName(parameters) { functionName(parameters); } B) returnType functionName(parameters) { functionName(); } C) functionName(parameters) { return functionName(parameters); } D) None of the above

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Answer & Solution

Answer: Option A

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13

What is the purpose of a function header in C++?

A) Contains the actual code of the function B) Specifies the function's location in memory C) Declares the name, return type, and parameters of the function D) Provides default arguments for the function

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Answer & Solution

Answer: Option C

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14

What will be the output of the following code: int max(int a, int b) { return (a > b) ? a : b; } cout << max(5, 3); in C++?

A) max(5, 3) B) 3 C) Compilation error due to missing function definition D) max(3, 5)

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Answer & Solution

Answer: Option A

Solution:

The given code defines a function named max which takes two integers a and b as input and returns the maximum of the two. In the main function, max(5, 3) is called, but it is directly printed to the output without any calculation. Therefore, the output will be max(5, 3), representing the function call.

15

Which of the following is true about function recursion in C++?

A) Recursion can only be achieved through function pointers B) Recursion is limited to predefined standard functions C) A function calling itself directly or indirectly D) Recursion is not allowed in C++

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Answer & Solution

Answer: Option C

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16

What is the purpose of a function in C++?

A) To declare variables B) To print output C) To initialize memory D) To perform a specific task

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Answer & Solution

Answer: Option D

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17

Which of the following is true about function parameters in C++?

A) They are variables used to pass data into functions B) They are placeholders for function names C) They are used to return values from functions D) They are only used in main functions

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Answer & Solution

Answer: Option A

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18

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

A) void functionName(); B) functionName(int); C) functionName() int; D) int functionName();

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Answer & Solution

Answer: Option D

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19

What is the purpose of the 'void' keyword in a function declaration in C++?

A) Indicates that the function accepts no parameters B) Indicates that the function returns a void pointer C) Indicates that the function does not return a value D) Indicates that the function is a member function

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Answer & Solution

Answer: Option C

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20

What is the output of the following code: int multiply(int x, int y) { return x * y; } int main() { cout << multiply(3, 4); } in C++?

A) multiply(3, 4) B) 12 C) Compilation error due to missing return statement D) multiply(4, 3)

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Answer & Solution

Answer: Option B

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Functions and Procedures in C++ MCQ question and answer with solution | C++ Programimg MCQs