MCQ On References in C++: Multiple Choice Questions and Answers On C++ References

MCQ on references in C++ with answers and explanations for placement tests and job interviews. This C++ MCQ on references is useful for the campus placement for all freshers including Engineering Students, MCA students, Computer and IT Engineers, etc.

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Guideline of MCQ on references in C++:

This MCQ on references in C++ is intended for checking your knowledge of C++ references. It takes 30 minutes to pass the C++ quiz on reference. If you don’t finish the C++ reference quiz within the mentioned time, all the unanswered questions will count as wrong. Every unanswered question will count as wrong. Quiz on reference in C++ has randomization features that give you a new question set at every attempt.

In this MCQ on references in C++, we have also implemented a feature that not allowed the user to see the next question or finish the quiz without attempting the current C++ references quiz.

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MCQ On C++ References

MCQ On C++ References

1 / 15

How many objects reference can refer to during its lifetime?

2 / 15

#include<iostream>
using namespace std;
 
int &fun()
{
    int x = 10;
    return x;
}
int main()
{
    fun() = 30;
    cout << fun();
    return 0;
}

May cause runtime error

May cause compiler error

Always works fine.

3 / 15

Which of the following is FALSE about references in C++

References cannot be NULL

A reference must be initialized when declared

Once a reference is created, it cannot be later made to reference another object; it cannot be reset.

References cannot refer to constant value

4 / 15

Pick the correct statement about references in C++.

References stores the address of variables

References and variables both have the same address

References were also available in C

References use dereferencing operator(*) to access the value of variable its referencing

5 / 15

Pick the correct statement about references.

References can be assigned value NULL

Reference should not be initialized when created.

Reference is the same as pointers

References once assigned cannot be changed to refer another variable.

6 / 15

Output of following C++ program?

#include<iostream>
using namespace std;
 
int main()
{
  int x = 10;
  int& ref = x;
  ref = 20;
  cout << "x = " << x << endl ;
  x = 30;
  cout << "ref = " << ref << endl;
  return 0;
}

1.

x = 20
ref = 30

2.

x = 20
ref = 20

3.

x = 10
ref = 30

4.

x = 30
ref = 30

7 / 15

A reference is declared using the _____ symbol.

8 / 15

What is the return value of f(p, p) if the value of p is initialized to 5 before the call? Note that the first parameter is passed by reference, whereas the second parameter is passed by value.

int f(int &x, int c) {
   c  = c - 1;
   if (c == 0) return 1;
   x = x + 1;
   return f(x, c) * x;
}

3024

6561

55440

161051

9 / 15

Why is this not a reference?

Because this was introduced into C++ before references were added.

Because pointer is powerful than reference.

Both Statement are wrong.

10 / 15

What is the output?

#include <iostream>
#include <string>
#include <cstdlib>

using namespace std;

int main()
{
    int a = 5;
    int *p = &a;
    int &q = p;
    cout<<p;
    return 0;
}

Address of pointer

Runtime Error

Compiler Error

11 / 15

Can you reseat a reference to make it refer to a different object in C++?

Yes

Never

Could be

Depend on environment

12 / 15

Which of the following functions must use reference.

Assignment operator function

Copy Constructor

Destructor

Parameterized constructor

13 / 15

Which of the following statement is correct about the references?

A reference must always be initialized within functions.

A reference must always be initialized outside all functions.

A reference must always be initialized.

All statement is wrong.

14 / 15

Predict the output of following C++ program.

#include<iostream>
using namespace std;
 
int &fun()
{
    static int x = 10;
    return x;
}
int main()
{
    fun() = 30;
    cout << fun();
    return 0;
}

Compiler Error: Function cannot be used as lvalue

15 / 15

If a function receives a reference to a variable, can it modify the value of the variable?

We can not pass variable as a reference.

Yes

None of the mentioned statement.

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MCQ On References in C++: Multiple Choice Questions and Answers On C++ References

Guideline of MCQ on references in C++:

You have 30 minutes to take the MCQs on Reference in C++

Your time has been Over.

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