CPP Programming MCQ Questions with answers and solutions Page 5

Q. In C++, const qualifier can be applied to
1) Member functions of a class
2) Function arguments
3) To a class data member which is declared as static
4) Reference variables

(A) Only 1, 2 and 3
(B) Only 1, 2 and 4
(C) All
(D) Only 1, 3 and 4

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✅ Correct Answer: (C) All

Published by Mr. Dubey ⭐ 111.54K Points at 14-Jun-2020 11:59 am in CPP Programming

Q. How to create a dynamic array of pointers (to integers) of size 10 using new in C++? Hint: We can create a non-dynamic array using int *arr[10]

(A) int *arr = new int *[10];
(B) int **arr = new int *[10];
(C) int *arr = new int [10];
(D) Not Possible

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✅ Correct Answer: (B) int **arr = new int *[10];

Published by Mr. Dubey ⭐ 111.54K Points at 14-Jun-2020 11:59 am in CPP Programming

Q. Which of the following is true about new when compared with malloc:
1) new is an operator, malloc is a function
2) new calls constructor, malloc doesn’t
3) new returns appropriate pointer, malloc returns void * and pointer needs to typecast to appropriate type.

(A) 1 and 3
(B) 2 and 3
(C) 1 and 2
(D) All 1, 2 and 3

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✅ Correct Answer: (D) All 1, 2 and 3

Published by Mr. Dubey ⭐ 111.54K Points at 14-Jun-2020 11:59 am in CPP Programming

Q. Predict the output?
#include <iostream>
using namespace std;
class Test
{
int x;
Test()
{
x = 5;
} };
int main()
{
Test *t = new Test;
cout << t->x;
}

(A) Compiler Error
(B) 5
(C) Garbage Value
(D) 0

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✅ Correct Answer: (A) Compiler Error

Published by Mr. Dubey ⭐ 111.54K Points at 14-Jun-2020 11:59 am in CPP Programming

Q. Is it fine to call delete twice for a pointer?
#include<iostream>
using namespace std;
int main()
{
int *ptr = new int;
delete ptr;
delete ptr;
return 0;
}

(A) Yes
(B) No
(C) none
(D) all

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✅ Correct Answer: (B) No

Published by Mr. Dubey ⭐ 111.54K Points at 14-Jun-2020 11:59 am in CPP Programming

Q. When the inheritance is private, the private methods in base class are __________ in the derived class (in C++).

(A) inaccessible
(B) accessible
(C) protected
(D) public

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✅ Correct Answer: (A) inaccessible

Published by Mr. Dubey ⭐ 111.54K Points at 14-Jun-2020 11:59 am in CPP Programming

Q. What happens when delete is used for a NULL pointer?
int *ptr = NULL;
delete ptr;

(A) Compiler Error
(B) Run-time Crash
(C) No Error
(D) None

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✅ Correct Answer: (C) No Error

Published by Mr. Dubey ⭐ 111.54K Points at 14-Jun-2020 11:59 am in CPP Programming

Q. Which of the following is true about virtual functions in C++?

(A) Virtual functions are functions that can be overridden in derived class with the same signature.
(B) Virtual functions enable run-time polymorphism in a inheritance hierarchy.
(C) If a function is ‘virtual’ in the base class, the most-derived class implementation of the function is called according to the actual type of the object referred to, regardless of the declared type of the pointer or reference. In non-virtual f
(D) All of the above

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✅ Correct Answer: (D) All of the above

Published by Mr. Dubey ⭐ 111.54K Points at 14-Jun-2020 11:59 am in CPP Programming

Q. Which of the following is true about pure virtual functions?
1) Their implementation is not provided in a class where they are declared.
2) If a class has a pure virtual function, then the class becomes abstract class and an
instance of this class cannot be created.

(A) Both 1 and 2
(B) Only 1
(C) Only 2
(D) Neither 1 nor 2

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✅ Correct Answer: (C) Only 2

Published by Mr. Dubey ⭐ 111.54K Points at 14-Jun-2020 11:59 am in CPP Programming

Q. What is the size of wchar_t in C++?

(A) 2
(B) 4
(C) 2 or 4
(D) Based on the number of bits in the system

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✅ Correct Answer: (D) Based on the number of bits in the system

Published by Mr. Dubey ⭐ 111.54K Points at 14-Jun-2020 11:59 am in CPP Programming

CPP Programming MCQs | Page - 5

Q. In C++, const qualifier can be applied to
1) Member functions of a class
2) Function arguments
3) To a class data member which is declared as static
4) Reference variables

Q. How to create a dynamic array of pointers (to integers) of size 10 using new in C++? Hint: We can create a non-dynamic array using int *arr[10]

Q. Which of the following is true about new when compared with malloc:
1) new is an operator, malloc is a function
2) new calls constructor, malloc doesn’t
3) new returns appropriate pointer, malloc returns void * and pointer needs to typecast to appropriate type.

Q. Predict the output?
#include <iostream>
using namespace std;
class Test
{
int x;
Test()
{
x = 5;
} };
int main()
{
Test *t = new Test;
cout << t->x;
}

Q. Is it fine to call delete twice for a pointer?
#include<iostream>
using namespace std;
int main()
{
int *ptr = new int;
delete ptr;
delete ptr;
return 0;
}

Q. When the inheritance is private, the private methods in base class are __________ in the derived class (in C++).

Q. What happens when delete is used for a NULL pointer?
int *ptr = NULL;
delete ptr;

Q. Which of the following is true about virtual functions in C++?

Q. Which of the following is true about pure virtual functions?
1) Their implementation is not provided in a class where they are declared.
2) If a class has a pure virtual function, then the class becomes abstract class and an
instance of this class cannot be created.

Q. What is the size of wchar_t in C++?

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CPP Programming MCQs | Page - 5

Q. In C++, const qualifier can be applied to 1) Member functions of a class 2) Function arguments 3) To a class data member which is declared as static 4) Reference variables

Q. How to create a dynamic array of pointers (to integers) of size 10 using new in C++? Hint: We can create a non-dynamic array using int *arr[10]

Q. Which of the following is true about new when compared with malloc: 1) new is an operator, malloc is a function 2) new calls constructor, malloc doesn’t 3) new returns appropriate pointer, malloc returns void * and pointer needs to typecast to appropriate type.

Q. Predict the output? #include <iostream> using namespace std; class Test { int x; Test() { x = 5; } }; int main() { Test *t = new Test; cout << t->x; }

Q. Is it fine to call delete twice for a pointer? #include<iostream> using namespace std; int main() { int *ptr = new int; delete ptr; delete ptr; return 0; }

Q. When the inheritance is private, the private methods in base class are __________ in the derived class (in C++).

Q. What happens when delete is used for a NULL pointer? int *ptr = NULL; delete ptr;

Q. Which of the following is true about virtual functions in C++?

Q. Which of the following is true about pure virtual functions? 1) Their implementation is not provided in a class where they are declared. 2) If a class has a pure virtual function, then the class becomes abstract class and an instance of this class cannot be created.

Q. What is the size of wchar_t in C++?

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Q. In C++, const qualifier can be applied to
1) Member functions of a class
2) Function arguments
3) To a class data member which is declared as static
4) Reference variables

Q. Which of the following is true about new when compared with malloc:
1) new is an operator, malloc is a function
2) new calls constructor, malloc doesn’t
3) new returns appropriate pointer, malloc returns void * and pointer needs to typecast to appropriate type.

Q. Predict the output?
#include <iostream>
using namespace std;
class Test
{
int x;
Test()
{
x = 5;
} };
int main()
{
Test *t = new Test;
cout << t->x;
}

Q. Is it fine to call delete twice for a pointer?
#include<iostream>
using namespace std;
int main()
{
int *ptr = new int;
delete ptr;
delete ptr;
return 0;
}

Q. What happens when delete is used for a NULL pointer?
int *ptr = NULL;
delete ptr;

Q. Which of the following is true about pure virtual functions?
1) Their implementation is not provided in a class where they are declared.
2) If a class has a pure virtual function, then the class becomes abstract class and an
instance of this class cannot be created.