C++ Multiple Choice Questions for Practitioners

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Question: 26

Can we have constructor as Virtual?

(A) Yes
(B) No

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Level: Practitioner

Category of MCQ: virtual_func in C++

Question: 27

Is duplicate data allowed in set?

(A) Yes
(B) No

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Level: Practitioner

Category of MCQ: stl in C++

Question: 28

Which data structure is used by Map?

(A) AVL Tree
(B) Binary Tree
(C) Balance Binary Tree
(D) None of these

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Level: Practitioner

Category of MCQ: stl in C++

Question: 29

From which STL we can insert/remove data
from anywhere?

(A) Vector
(B) Deque
(C) Stack
(D) List

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Level: Practitioner

Category of MCQ: stl in C++

Question: 30

What is Singleton class?

(A) We can create n number of object
(B) We can create max 256 objects
(C) We can create 1 object
(D) We cant create object

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Level: Practitioner

Category of MCQ: classesAndobjects in C++

Question: 31

Which one is more faster?
A - #include <iostream.h>
B - #include "iostream.h"

(A) A
(B) B
(C) Both has are same
(D) Depends on Compiler

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Level: Practitioner

Category of MCQ: other in C++

Question: 32

What is Self Referential Structure?

(A) Structure which contains pointers
(B) Structure which has pointer to itself
(C) Structure which contains another structure
(D) None of these

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Level: Practitioner

Category of MCQ: structure in C++

Question: 33

What should be output of below C++ program
if user enters a = 5?

int main()
{
    int a;
    cin>>a; // user can enter any value
    
	if (++a*5 <= 25)
	{
	    cout<<"Hello";
	}
	else
	{
	    cout<<"Bye";	
	}

}

(A) Hello
(B) Bye
(C) Undefined
(D) Compilation Error

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Level: Practitioner

Category of MCQ: conditional in C++

Question: 34

//Find the output of below program:-

int main() 
{
int i = 0, x = 0;

do
{
    if(i % 5 == 0)
    {
       std::cout<<x;
       x++;
    }

    ++i;
}while(i<10);

cout<<x;

return 0;
}

(A) 01
(B) 012
(C) 0
(D) 0123

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Level: Practitioner

Category of MCQ: loops in C++

Question: 35

What should be printed on screen?

int main() 
{
int x = 5;

if(x++ == 5)
cout<<"Five"<<endl;
else
if(++x == 6)
cout<<"Six"<<endl;

return 0;
}

(A) FiveSix
(B) Five
(C) Six
(D) None of these

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Level: Practitioner

Category of MCQ: conditional in C++

Question: 36

//Find output of below program

#include<iostream>

int main()
{
int c1,c2;
int a = -8;
int b = 3;
c1 = --a + b;
c2 = a-- + b;
std::cout<<"c1="<<c1<<", "<<"c2="<<c2<<endl;

return 0;
}

(A) c1=-7,c2=-4
(B) c1=-7,c2=-3
(C) c1=-4,c1=b-3
(D) c1=-6,c2=-6

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Level: Practitioner

Category of MCQ: operators in C++

Question: 37

//Find the output of below program.

#include<iostream>

int main()
{
for(int i=1;i<=2;i++)
{
for(int j=i;j<=2;j++)
std::cout<<i<<@;
}
}

(A) 1@2@
(B) 1@2@1@
(C) 1@1@2@
(D) 1@2@2@

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Level: Practitioner

Category of MCQ: loops in C++

Question: 38

Which exception is thrown when dynamic_cast fails?

(A) std::bad_typeid
(B) std::logic_error
(C) std::runtime_error
(D) std::bad_cast

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Level: Practitioner

Category of MCQ: dynamic_cast in C++

Question: 39

Which is the Parent class for all exceptions?

(A) std::bad_exception
(B) std::logic_error
(C) std::exception
(D) std::runtime_error

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Level: Practitioner

Category of MCQ: exceptions in C++

Question: 40

What is the extention of the executable file produced
after compiling C/C++ code using g++ on Linux?

(A) .exe
(B) .out
(C) .lib
(D) .a

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Level: Practitioner

Category of MCQ: other in C++

Question: 41

Car contains Engine. Which type of relationship is it?

(A) IS-A relation
(B) HAS-A relation
(C) None of these

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Level: Practitioner

Category of MCQ: classesAndobjects in C++

Question: 42

Are both of the preprocessor directives solving same purpose?

#include <iostream.h>

#include "iostream.h"

(A) Yes
(B) No
(C) Depends on compiler
(D) None of these

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Level: Practitioner

Category of MCQ: other in C++

Question: 43

Which keyword is used to write Assembly code within a C++ program?

(A) ASM
(B) asm
(C) Not possible
(D) Compiler specific

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Level: Practitioner

Category of MCQ: other in C++

Question: 44

#include<iostream>

int main()
{
if(-1 == -1){
std::cout<<"Hey..";
}
else{        std::cout<<"CppBuzz.com";
}

return 0;
}

(A) Hey..
(B) CppBuzz.com
(C) Compilation Error
(D) None of these

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Level: Practitioner

Category of MCQ: conditional in C++

Question: 45

Estimated C++ users?

(A) 1 Million +
(B) 2 Million +
(C) 3 Million +
(D) 4 Million +

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Level: Practitioner

Category of MCQ: other in C++

Question: 46

If C functions will be called from C++, 
then C include files will use the following declaration.
is this True / False?

#ifdef __cplusplus
extern "C" {
#endif

//C function declarations

#ifdef __cplusplus
}
#endif

(A) True
(B) False

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Level: Practitioner

Category of MCQ: other in C++

Question: 47

Which one of these is not a keyword?

(A) do
(B) sizeof()
(C) goto
(D) sqrt()

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Level: Practitioner

Category of MCQ: keyword in C++

Question: 48

C++ 11 introduces a new keyword. Find out that keyword.

(A) pragma
(B) override
(C) wchar_t
(D) mutable

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Level: Practitioner

Category of MCQ: cpp11 in C++

Question: 49

What is the use of mutable keyword?

(A) It makes variable constant
(B) There is no such keyword in C++
(C) It allows a class data member to be modified even though it is the data member of a const object
(D) None of these

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Level: Practitioner

Category of MCQ: keyword in C++

Question: 50

Why use register keyword in C++ code?

(A) It saves the memory
(B) It runs code faster by allocating varibales in CPU register
(C) It takes extra bytes of memory
(D) Register variable are used with high configuration machines

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Level: Practitioner

Category of MCQ: keyword in C++

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