CPP Programming MCQ Questions with answers and solutions Page 2

Q. 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;
}

(A) x = 20; ref = 30
(B) x = 20; ref = 20
(C) x = 10; ref = 30
(D) x = 30; ref = 30

✅ Correct Answer: (A) x = 20; ref = 30

Published by Mr. Dubey ⭐ 109.87K Points at 14-Jun-2020 11:59 am in CPP Programming

Q. What is the difference between struct and class in C++?

(A) All members of a structure are public and structures don’t have constructors and destructors
(B) Members of a class are private by default and members of struct are public by default. When deriving a struct from a class/struct, default access-specifier for a base class/struct is public and when deriving a class, default access specifier is private.
(C) All members of a structure are public and structures don’t have virtual functions
(D) All of the above

✅ Correct Answer: (B) Members of a class are private by default and members of struct are public by default. When deriving a struct from a class/struct, default access-specifier for a base class/struct is public and when deriving a class, default access specifier is private.

Published by Mr. Dubey ⭐ 109.87K Points at 14-Jun-2020 11:59 am in CPP Programming

Q. Predict the output of following C++ program.
#include<iostream>
using namespace std;
class Empty {};
int main() {
cout << sizeof(Empty);
return 0;
}

(A) A non-zero value
(B) 0
(C) Compiler Error
(D) Runtime Error

💬 Discuss

✅ Correct Answer: (A) A non-zero value

Published by Mr. Dubey ⭐ 109.87K Points at 14-Jun-2020 11:59 am in CPP Programming

Q. class Test {
int x;
};
int main() {
Test t;
cout << t.x;
return 0;
}

(A) 0
(B) Garbage Value
(C) Compiler Error
(D) None

💬 Discuss

✅ Correct Answer: (C) Compiler Error

Published by Mr. Dubey ⭐ 109.87K Points at 14-Jun-2020 11:59 am in CPP Programming

Q. Which of the following is true?

(A) All objects of a class share all data members of class
(B) Objects of a class do not share non-static members. Every object has its own copy.
(C) Objects of a class do not share codes of non-static methods, they have their own copy
(D) None of the above

💬 Discuss

✅ Correct Answer: (B) Objects of a class do not share non-static members. Every object has its own copy.

Published by Mr. Dubey ⭐ 109.87K Points at 14-Jun-2020 11:59 am in CPP Programming

Q. A member function can always access the data in __________, (in C++).

(A) the class of which it is member
(B) the object of which it is a member
(C) the public part of its class
(D) the private part of its class

💬 Discuss

✅ Correct Answer: (A) the class of which it is member

Published by Mr. Dubey ⭐ 109.87K Points at 14-Jun-2020 11:59 am in CPP Programming

Q. Which of the following is not correct for virtual function in C++?

(A) Must be declared in public section of class.
(B) Virtual function can be static.
(C) Virtual function should be accessed using pointers.
(D) Virtual function is defined in base class.

💬 Discuss

✅ Correct Answer: (B) Virtual function can be static.

Published by Mr. Dubey ⭐ 109.87K Points at 14-Jun-2020 11:59 am in CPP Programming

Q. Which of the following is not correct (in C++)?
1. Class templates and function templates are instantiated in the same way
2. Class templates differ from function templates in the way they are initiated
3. Class template is initiated by defining an object using the template argument
4. Class templates are generally used for storage classes

(A) (1)
(B) (2), (4)
(C) (2), (3), (4)
(D) (4)

💬 Discuss

✅ Correct Answer: (C) (2), (3), (4)

Published by Mr. Dubey ⭐ 109.87K Points at 14-Jun-2020 11:59 am in CPP Programming

Q. Which of the following cannot be passed to a function in C++?

(A) Constant
(B) Structure
(C) Array
(D) Header file

💬 Discuss

✅ Correct Answer: (D) Header file

Published by Mr. Dubey ⭐ 109.87K Points at 14-Jun-2020 11:59 am in CPP Programming

Q. Which of the following, in C++, is inherited in a derived class from base class?

(A) Constructor
(B) Destructor
(C) Data members
(D) Virtual methods

💬 Discuss

✅ Correct Answer: (C) Data members

Published by Mr. Dubey ⭐ 109.87K Points at 14-Jun-2020 11:59 am in CPP Programming

CPP Programming MCQs | Page - 2

Q. 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;
}

Q. What is the difference between struct and class in C++?

Q. Predict the output of following C++ program.
#include<iostream>
using namespace std;
class Empty {};
int main() {
cout << sizeof(Empty);
return 0;
}

Q. class Test {
int x;
};
int main() {
Test t;
cout << t.x;
return 0;
}

Q. Which of the following is true?

Q. A member function can always access the data in __________, (in C++).

Q. Which of the following is not correct for virtual function in C++?

Q. Which of the following cannot be passed to a function in C++?

Q. Which of the following, in C++, is inherited in a derived class from base class?

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CPP Programming MCQs | Page - 2

Q. 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; }

Q. What is the difference between struct and class in C++?

Q. Predict the output of following C++ program. #include<iostream> using namespace std; class Empty {}; int main() { cout << sizeof(Empty); return 0; }

Q. class Test { int x; }; int main() { Test t; cout << t.x; return 0; }

Q. Which of the following is true?

Q. A member function can always access the data in __________, (in C++).

Q. Which of the following is not correct for virtual function in C++?

Q. Which of the following cannot be passed to a function in C++?

Q. Which of the following, in C++, is inherited in a derived class from base class?

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Q. 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;
}

Q. Predict the output of following C++ program.
#include<iostream>
using namespace std;
class Empty {};
int main() {
cout << sizeof(Empty);
return 0;
}

Q. class Test {
int x;
};
int main() {
Test t;
cout << t.x;
return 0;
}