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C Interview: Practice MCQ Questions and Answers

Browse topic-based C Interview practice sets to strengthen concepts and improve problem-solving skills.

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Programming45

C InterviewMediumProgramming

41.

What will be the output of the following C++ code

#include <iostream>

#include <array>

using namespace std;

int main(int argc, char const *argv[])

{

array<int,arr arr1.fill(2);

for(int i=0;i<5;i++)

cout<<arr1[i];

cout<<endl;

return}

20000

20002

22222

00002

Answer and explanation

Correct Answer: C — 22222

empty() function is used to check whether the size of an array class is zero or not. It is not used to check whether an array is empty or not. The function true only if size/max_size of an array is zero otherwise it returns false.

C InterviewMediumProgramming

42.

What is the use of fill() function in array class?

To check whether given element fills the array or not

To replace all the elements of the array which are equal to the given value

To delete all the elements that are equal to the given value

To fill an array with a given single value

Answer and explanation

Correct Answer: B — To replace all the elements of the array which are equal to the given value

As the size of both the array classes is not equal therefore the swap function gives an error stating that no matching function available.

C InterviewMediumProgramming

43.

What is the use of empty() function in array classes?

To check whether the size of an array is zero or not

To check how many elements are there in the array

To check whether an array contains negative elements or not

To check whether an array is empty or not

Answer and explanation

Correct Answer: A — To check whether the size of an array is zero or not

No explanation is available for this question yet.

C InterviewHardProgramming

44.

What is the syntax of swap()?

arr1.swap(arr2);

swap<int, int>(arr1, arr2);

swap(arr1, arr2);

swap[arr1, arr2];

Answer and explanation

Correct Answer: A — arr1.swap(arr2);

The correct syntax of swap function is arr1.swap(arr2) i.e. one array calling swap() function with second array as parameter to swap function. Also swap is a function therefore [] operator cannot be used to call swap function.

C InterviewMediumProgramming

45.

What is the use of swap() function in array class?

Swaps two arrays

Swaps same elements of the array if required

Swaps two elements given indices of elements

Swaps two elements of an array given elements

Answer and explanation

Correct Answer: A — Swaps two arrays

swap() function is used to swap elements of two array classes provided the size of both arrays classes are same.

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C Interview: Practice MCQ Questions and Answers