C++ OOPs Interview Questions & Ans

Question: 1

What is the full form of oop

(A) Object oriented programming
(B) Oriented object programming
(C) Office oriented programming
(D) office objective programming

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Question: 2

//What should be the output of below program?

#include<iostream>

int main()
{
 
std::cout<<"CppBuzz";;;;;  
 return 0;                                                                          
}

(A) Compilation Error
(B) Runtime Error
(C) CppBuzz
(D) CppBuzz;;;;

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Question: 3

C++ is superset of which langauge?

(A) BASIC
(B) VB
(C) PASCAL
(D) C

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Question: 4

#include<iostream>

int main()
{

std::cout<<-1-1-1;

return 0;
}

(A) Compilation Error
(B) 0
(C) 3
(D) -3

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Question: 5

Can we create array of reference?

(A) Yes
(B) No

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Question: 6

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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Question: 7

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

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Question: 8

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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Question: 9

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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Question: 10

What is the latest version of C++?

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

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Question: 11

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

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

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Question: 12

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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Question: 13

Estimated C++ users?

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

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Question: 14

Which language is not a true object-oriented programming language?

(A) VB.NET
(B) VB 6
(C) C++
(D) C#

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Question: 15

What do you understand by GUI?

(A) Uses buttons, menus, and icons
(B) Should be easy for a user to manipulate
(C) Stands for Graphic Use Interaction
(D) Both A and B

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Question: 16

Which file format is used in Binaries on Linux

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

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Question: 17

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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Question: 18

The following code will fail to compile:

template <typename T, typename U>
void call_foo(T t, U u) {
  t.foo<U>(u);
}

How would you fix this?

(A) t.foo template<U>(u);
(B) t.foo<typename U>(u);
(C) t.template foo<U>(u);
(D) typename t.foo<U>(u);

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Question: 19

What is the advantage of local variable?

(A) It saves memory
(B) It releases memory once it go out of scope
(C) It inrease execution time of program
(D) None of these

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Question: 20

Which one of these takes more memory?

(A) Pass by Value
(B) Pass by reference
(C) Pass by pointer/address
(D) Depends on Compiler

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Question: 21

Which one of these is invalide file mode?

(A) ios::trunc
(B) ios::ate
(C) ios::app
(D) ios::tellg

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Question: 22

In the below program 
int main(int argc, char *argv[]){}
what would be the value of argv[argc]?

(A) Filename
(B) First argument
(C) Last argument
(D) NULL pointer

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Question: 23

Which one is true ?

(A) We can create link using structure only
(B) We can create link list using class only
(C) We can create link list either by class or structure
(D) We should ignore implementation of link list using structure as it consume more memory

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Question: 24

Which of the following is not a C++ Library?

(A) QT
(B) SDL
(C) WxWidget
(D) Bootstrap

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Question: 25

The command nm on linux lists few symbols. What symbol 'D'represents?

(A) Normal Data Section
(B) Un initialized data section
(C) Initialized data section
(D) None of the above

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Question: 26

Data stored in RAM disappears once a program ends or the computer is powered down.

(A) TRUE
(B) FALSE

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Question: 27

Which directive is used to create an “include guard”,
which allows a program to be conditionally compiled.
This prevents a header file from being included more than once

(A) #include
(B) #guard
(C) #ifndef
(D) endif

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C++ OOPs Interview Questions & Ans : (27)

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