C++ MCQs with answers Page - 18

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Q. Which of the followings is/are not false about friend function ?

1. It can be called / invoked with class object.
2. It has objects as arguments.
3. It can have built-in types as arguments.
4. It must declared only in public part of a class.
5. It does not have this pointer as an argument.

  • (A) Only 2,4
  • (B) Only 1,2,5
  • (C) Only 2,3,5
  • (D) All of these

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Q. Predict the output:

Code: 
int x = 786;
cout << setfill(‘*’) << setw(6) << x;
  • (A) 786***
  • (B) **786
  • (C) ***786
  • (D) ******

A

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Q. Default return type of functions in CPP is ____ .

  • (A) void
  • (B) long
  • (C) char
  • (D) Int

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Q. During a class inheritance in CPP, if the visibility mode or mode of derivation is not provided, then by default visibility mode is ___________.

  • (A) public
  • (B) protected
  • (C) private
  • (D) Friend

A

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Q. The derivation of Child class from Base class is indicated by ____ symbol.

  • (A) ::
  • (B) :
  • (C) ;
  • (D) |

A

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Q. If we have object from fstream class, then what is the default mode of opening the file?

  • (A) ios::in|ios::out
  • (B) ios::in|ios::out|ios::trunc
  • (C) ios::in|ios::trunc
  • (D) Default mode depends on compiler

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Q. __________ is return type of is_open() function.

  • (A) int
  • (B) bool
  • (C) float
  • (D) char *

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Q. What happens if the following program is run in C and C++?

Code: 
#include<stdio.h>
int main() 
{ 
   display();
}  
int display() 
{ 
   printf("Hello World!"); 
   return 0;  
}
  • (A) Error in C and C++
  • (B) Warning in C and C++
  • (C) Error in C++ but warning in C
  • (D) Error in C but warning in C++

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Q. Which of the following types is not present in C but present in C++?

  • (A) void
  • (B) bool
  • (C) float
  • (D) int

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Q. What is the size of a boolean variable in C++?

  • (A) 1 bit
  • (B) 1 byte
  • (C) 4 bytes
  • (D) 2 bytes

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