C++ Objective Questions for Practitioners

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Question: 1

Can we typecast void * into int *?

(A) Yes
(B) No
(C) Undefined
(D) Depends on Compiler

Compiler
Level: Practitioner Category: datatype

Question: 2

#include<iostream>

void Execute(int &x, int y = 200)
{
 int TEMP = x + y;
 x+= TEMP;
 if(y!=200)
     std::cout<<TEMP<<x<<y<<"--";
}

int main()
{
 int A=50, B=20;
 std::cout<<A<<B<<"--";
 Execute(A,B);
 std::cout<<A<<B<<"--";
 return 0;
}

(A) 5020--5020--
(B) 5020--7012020--12020--
(C) 5020--70120200--5020
(D) 5020--7050200--5020--

Compiler
Level: Practitioner Category: function

Question: 3

How many times CppBuzz.com is printed?

#include<iostream>

int main()
{
    int i=0;
    lbl:
    std::cout<<"CppBuzz.com";
    i++;
    if(i<5)
    {
	goto lbl;
    }

    return 0;

}

(A) Error
(B) 5 times
(C) 4 times
(D) 6 times

Compiler
Level: Practitioner Category: loops

Question: 4

How to access and edit data in data file handling using structures

(A) read()
(B) write()
(C) both A and B
(D) without read()

Compiler
Level: Practitioner Category: operators

Question: 5

Which operator has highest precedence in * / % ?

(A) *
(B) /
(C) %
(D) all have same precedence

Compiler
Level: Practitioner Category: operators

Question: 6

What should be the output of below program?

#include<iostream>

int main()
{
    int a = 1;
    switch(a)
    {
    case 1: std::cout<<"One";
    case 2: std::cout<<"Two";
    case 3: std::cout<<"Three";
    default: std::cout<<"Default";
    }
    return 0;

}

(A) One
(B) Compilation Error
(C) Default
(D) OneTwoThree

Compiler
Level: Practitioner Category: conditional

Question: 7

What is abstract class?

(A) A class with abstract keyword
(B) A class with no functions in it
(C) A class with atleast one pure virtual function
(D) Empty Class

Compiler
Level: Practitioner Category: polymorphism

Question: 8

What is the size of empty class?

(A) 0
(B) 1
(C) 2
(D) 4

Compiler
Level: Practitioner Category: datatype

Question: 9

Can a class contain another class in it ?

(A) Yes
(B) No

Compiler
Level: Practitioner Category: datatype

Question: 10

Can we create our own workspace?

(A) Yes
(B) No

Compiler
Level: Practitioner Category: datatype

Question: 11

When can we have two classes with same name?

(A) We cant have
(B) In different work space
(C) Can have but in different file
(D) We can have in any scenario

Compiler
Level: Practitioner Category: datatype

Question: 12

Can we create array of reference?

(A) Yes
(B) No

Compiler
Level: Practitioner Category: other

Question: 13

How to stop Name Mangling in C++?

(A) It is not possible
(B) It is possible only with C code
(C) By using extern "C" keyword
(D) By Converting C++ code to C

Compiler
Level: Practitioner Category: function

Question: 14

Can we create object of Abstract class?

(A) Yes
(B) No

Compiler
Level: Practitioner Category: abstract_class

Question: 15

Can we have Constructor in Abstract class?

(A) Yes
(B) No

Compiler
Level: Practitioner Category: loops

Question: 16

Can we create pointer to Abstract class?

(A) Yes
(B) No

Compiler
Level: Practitioner Category: abstract_class

Question: 17

Can we create Nested classes in C++?

(A) Yes
(B) No

Compiler
Level: Practitioner Category: classesAndobjects

Question: 18

What is VTable?

(A) It contains VPTR
(B) It contains address of Virtual function
(C) It cotains address of Object
(D) None of these

Compiler
Level: Practitioner Category: vtable

Question: 19

Can this pointer point to another class?

(A) Yes
(B) No

Compiler
Level: Practitioner Category: classesAndobjects

Question: 20

What is dangling pointer?

(A) A pointer pointing to NULL
(B) Pointer pointing to memory location which has been freed
(C) Pointer which is pointing to new location
(D) None of these

Compiler
Level: Practitioner Category: pointers

Question: 21

Can we have Virtual Destructor ?

(A) Yes
(B) No