C++ Programming

FUNCTION DECLARATIONS MCQs

Total Questions : 9

Question 1.

How many minimum number of functions are need to be presented in c++?


  1.    0
  2.    1
  3.    2
  4.    3
 Discuss Question
Answer is Option B. -> 1

The main function is the mandatory part, it is needed for the execution of the program to start.

Question 2.

What is the scope of the variable declared in the user definied function?


  1.    whole program
  2.    only inside the {} block
  3.    both a and b
  4.    none of the mentioned
 Discuss Question
Answer is Option B. -> only inside the {} block

The variable is valid only in the function block as in other.

Question 3.


What is the output of this program?



1.
#include
2.
using namespace std;
3.
void fun(int x, int y)
4.
{
5.
x = 20;
6.
y = 10;
7.
}
8.
int main()
9.
{
10.
int x = 10;
11.
fun(x, x);
12.
cout
  1.    10
  2.    20
  3.    compile time error
  4.    none of the mentioned
 Discuss Question
Answer is Option A. -> 10

In this program, we called by value so the value will not be changed, So the output is 10
Output:
$ g++ fun.cpp
$ a.out
10

Question 4.


What is the output of this program?



1.
#include
2.
using namespace std;
3.
void mani()
4.
void mani()
5.
{
6.
cout
  1.    hai
  2.    haihai
  3.    compile time error
  4.    none of the mentioned
 Discuss Question
Answer is Option C. -> compile time error

We have to use the semicolon to declare the function in line 3. If we did means, the program 

will execute.

Question 5.

Which is more effective while calling the functions?


  1.    call by value
  2.    call by reference
  3.    call by pointer
  4.    none of the mentioned
 Discuss Question
Answer is Option B. -> call by reference

In the call by reference, it will just copy the address of the variable to access it, so it will reduce 

the memory in accessing it.

Question 6.

How many max number of arguments can present in function in c99 compiler?


  1.    99
  2.    90
  3.    102
  4.    127
 Discuss Question
Answer is Option D. -> 127

None.

Question 7.

Where does the execution of the program starts?


  1.    user-defined function
  2.    main function
  3.    void function
  4.    none of the mentioned
 Discuss Question
Answer is Option B. -> main function

Normally the execution of the program in c++ starts from main only.

Question 8.

which of the following is used to terminate the function declaration?


  1.    :
  2.    )
  3.    ;
  4.    none of the mentioned
 Discuss Question
Answer is Option C. -> ;

None.

Question 9.

What are mandatory parts in function declaration?


  1.    return type,function name
  2.    return type,function name,parameters
  3.    both a and b
  4.    none of the mentioned
 Discuss Question
Answer is Option A. -> return type,function name

In a function, return type and function name are mandatory all else are just used as a choice.