C++ Multiple Choice Questions for Experts

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Question: 1

What is size of void in C++?

(A) 2 Bytes
(B) 4 Bytes
(C) Undefined
(D) 0

Compiler

Level: Expert

Category of MCQ: loops in C++

Question: 2

#include<iostream>

class X
{
public: X()
        { std::cout<<"X"; }
        ~X()
        { std::cout<<"~X"; }
};

class Y : public X
{
public: Y()
        { std::cout<<"Y"; }
        ~Y()
        { std::cout<<"~Y"; }
};

int main()
{
    Y obj;
    return 0;
}

(A) XY~X~Y
(B) XY~Y~X
(C) X~XY~Y
(D) X~X~YY

Compiler

Level: Expert

Category of MCQ: inheritance in C++

Question: 3

When Virtual Table is created?

(A) Every Class has VTable
(B) Class inherited from other Class
(C) When a Class Overrides the function of Base class
(D) Class has atleast one Virtual Function

Compiler

Level: Expert

Category of MCQ: vtable in C++

Question: 4

Can we assign null to void pointer?

(A) No
(B) Yes

Compiler

Level: Expert

Category of MCQ: datatype in C++

Question: 5

Exceptions are Caught at ?

(A) Compilation Time
(B) Run Time
(C) Linking Time
(D) No

Compiler

Level: Expert

Category of MCQ: loops in C++

Question: 6

Which of the following is Memory Leak detection tool?

(A) GC++
(B) KDevelop
(C) GIT
(D) Valgrind

Compiler

Level: Expert

Category of MCQ: new_delete in C++

Question: 7

Can we overload Constructor?

(A) Yes
(B) No

Compiler

Level: Expert

Category of MCQ: classesAndobjects in C++

Question: 8

Can we call virtual function using object?

(A) Yes
(B) No

Compiler

Level: Expert

Category of MCQ: function in C++

Question: 9

If a class(has one virtual function) has 5 Objects then how many Vtable it  will have?

(A) 5
(B) 1
(C) 0
(D) Depends on Compiler

Compiler

Level: Expert

Category of MCQ: vtable in C++

Question: 10

#include<iostream>

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

for(i=1; i<10; i*=2)
{
    x++;
    std::cout<<x;
}
std::cout<<x;

return 0;
}

(A) 1234567899
(B) 12345678910
(C) 123455
(D) 12344

Compiler

Level: Expert

Category of MCQ: loops in C++

Question: 11

How many times 'its a while loop' should be printed?

int main()
{
int i = 1 ;
i = i - 1 ;

while(i)
{
    cout<<"its a while loop";
    i++ ;
}

return 0;
}

(A) 1
(B) 2
(C) 0
(D) Infinite Times

Compiler

Level: Expert

Category of MCQ: loops in C++

Question: 12

//Assume all headers are included
//What should be printed?

int main()
{
char Text[ ] = "Cpp@Buzz";

for(int I=0; Text[I]!='�';I++)
{
if(!isalpha(Text[I]))
Text[I]='*';
else if(isupper(Text[I]))
Text[I]=Text[I]+1;
else
Text[I] = Text[I+1];
}
cout<<Text;

return 0;
}

(A) *pp@*uzz
(B) CPP@BUZZ
(C) cpp@buzz
(D) Dp@*Czz

Compiler

Level: Expert

Category of MCQ: conditional in C++

Question: 13

Which Exception is thrown when new fails to allocate memory?

(A) std::exception
(B) std::bad_alloc
(C) std::runtime_error
(D) std::out_of_range

Compiler

Level: Expert

Category of MCQ: other in C++

Question: 14

Which part of memory is used for the allocation of local variables declared inside any function.

(A) Heap
(B) Stack
(C) Address Space
(D) Depends on Compiler

Compiler

Level: Expert

Category of MCQ: new_delete in C++

Question: 15

What is the latest version of C++?

(A) C++ 03
(B) C++ 11
(C) C++ 14
(D) C++ 17

Compiler

Level: Expert

Category of MCQ: other in C++

Question: 16

ISO/IEC 14882:1998 represents which version of C++?

(A) C++ 03
(B) C++ 98
(C) C++ 0X
(D) C++ 03

Compiler

Level: Expert

Category of MCQ: other in C++

Question: 17

Which of the following is the least safe type casting in C++?

(A) static_cast
(B) const_cast
(C) reinterpret_cast
(D) dynamic_cast

Compiler

Level: Expert

Category of MCQ: typecasting in C++

Question: 18

C++ 17 is also known as ___

(A) C++ 0x
(B) C++ 98
(C) C++ 1z
(D) C++ 11

Compiler

Level: Expert

Category of MCQ: cpp17 in C++

Question: 19

Which version of C++ introduced keyword - constexpr?

(A) C++0x
(B) C++11
(C) C++1z
(D) C++20

Compiler

Level: Expert

Category of MCQ: keyword in C++

Question: 20

What is the best way to convert int to string according to C++ standard?

(A) char *intStr = itoa(a); string str = string(intStr);
(B) std::string s = std::to_string(42);
(C) char stringNum[20]; int num=100; sprintf(stringNum,"%d",num);
(D) None of the above

Compiler

Level: Expert

Category of MCQ: function in C++

Question: 21

What is true ? when we explicitly declare a function to use the __fastcall convention.

(A) Arguments are placed in registers
(B) Arguments are placed in stack
(C) Arguments are placed in Heap
(D) None of the above

Compiler

Level: Expert

Category of MCQ: function in C++

Question: 22

Which one of these is not calling convention?

(A) cdecl
(B) syscall
(C) pascal
(D) register

Compiler

Level: Expert

Category of MCQ: function in C++

Question: 23

Which file format is used in Binaries on Linux

(A) ELF
(B) DLLs
(C) PE
(D) None of the above

Compiler

Level: Expert

Category of MCQ: other in C++

Question: 24

What is the correct syntax for lambda expression in C++11?

(A) [capture](parameters)->return-type {body}
(B) [parameters](capture)->return-type {body}
(C) [capture][parameters]->return-type {body}
(D) (capture)(parameters)->return-type {body}

Compiler

Level: Expert

Category of MCQ: cpp11 in C++

Question: 25

Does below code compiles successfully on C++11?

class C
{
 int a=7;

 public:
        C();
};

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