C++ Programming

HEADER FILES USAGE MCQs

Total Questions : 8

Question 1.


What is the output of this program?



1.
#include
2.
#include
3.
using namespace std;
4.
float avg( int Count, ... )
5.
{
6.
va_list Numbers;
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va_start(Numbers, Count);
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int Sum = 0;
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for (int i = 0; i < Count; ++i)
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Sum += va_arg(Numbers, int);
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va_end(Numbers);
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return (Sum/Count);
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}
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int main()
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{
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float Average = avg(10, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9);
17.
cout
  1.    4
  2.    5
  3.    6
  4.    compile time error
 Discuss Question
Answer is Option A. -> 4

In this program, we are finding the average of first 10 numbers using stdarg header file
Output:
$ g++ std.cpp
$ a.out
4

Question 2.

Which of the following header files is required for creating and reading data files?



  1.    ofstream.h
  2.    fstream.h
  3.    ifstream.h
  4.    console.h
 Discuss Question
Answer is Option B. -> fstream.h

In this fstream.h header file is used for accessing the files only.

Question 3.

setprecision requires which of the following header file?


  1.    stdlib.h
  2.    iomanip.h
  3.    console.h
  4.    conio.h
 Discuss Question
Answer is Option B. -> iomanip.h

The iomanip header file is used to correct the precision of the values.

Question 4.


What is the output of this program?



1.
#include
2.
using namespace std;
3.
int main()
4.
{
5.
char name[30];
6.
cout
  1.    jobsjobs
  2.    jobs
  3.    compile time error
  4.    program will not run
 Discuss Question
Answer is Option C. -> compile time error

In this program,we need to string header file to run this program.

Question 5.

What does a default header file contain?


  1.    prototype
  2.    implementation
  3.    declarations
  4.    none of the mentioned
 Discuss Question
Answer is Option C. -> declarations

In the header file, we define something that to be manipulated in the program.

Question 6.

Identify the incorrect statement.


  1.    iostream is a standard header and iostream.h is a non-standard header.
  2.    iostream is a non-standard header and iostream.h is a non-standard header.
  3.    iostream is a standard header and iostream.h is a standard header.
  4.    none of the mentioned
 Discuss Question
Answer is Option A. -> iostream is a standard header and iostream.h is a non-standard header.

The iostream.h is used in the older versions of c++ and iostream is evolved from it in the std 

namespace.

Question 7.

What is the user-defined header file extension in c++?


  1.    cpp
  2.    h
  3.    hf
  4.    none of the mentioned
 Discuss Question
Answer is Option B. -> h

None.

Question 8.

Which of the following keyword is used to declare the header file?


  1.    include
  2.    exclude
  3.    string
  4.    namespace
 Discuss Question
Answer is Option A. -> include

The include keyword is used to include all the required things to execute the given code 

in the program.