C# Questions & Answers on Use of Variable Number of Arguements for Freshers

1. The method in which large or variable number of arguments are handled is known as:

a) Value parameters
b) Output parameters
c) Parameter arrays
d) None of the mentioned

Answer: c

2. The modifiers used to define an array of parameters or list of arguments:

a) ref
b) out
c) param
d) var

Answer: c

3. What will be the output for the given set of code ?

1.  static void Main(string[] args)

2.  {

3.      object[] a = {" 1 ", 4.0f, " harsh "};

4.      fun(a);

5.      Console.ReadLine();

6.  }

7.  static void fun(params object[] b)

8.  {

9.      for (int i = 0; i < b.Length - 1; i++)

10.          Console.WriteLine(b[i] + " ");

11.  }

a) 1 4.0 harsh
b) 1 4
c) 1 4 hars
d) 1 4 harsh

Answer: d

Explanation: ‘a’ is declared as array of objects which is passed as a parameter to a single method fun() using variable number of parameters.
Output : 1 4 harsh

4. Which of the following statements are correct?

a) C SHARP allows a function to have arguments with default values
b) C SHARP allows a function to have variable number of arguments
c) Params is used to specify the syntax for a function with variable number of arguments
d) Omitting the return value type in method definition results into an exception

Answer: b, c

5. What will be the output of the set of code?

1. static void Main(string[] args)

2. {

3.     int [] a = {1, 2, 3, 4, 5};

4.     fun(a);

5.     Console.ReadLine();

6. }

7. static void fun(params int[] b )

8. {

9.     int[] k = { 3, 4, 7, 8,'\0' };

10.     for (int i = 0; i < b.Length; i++)

11.     {

12.         b[i] = b[i] + k[i] ;

13.         Console.WriteLine( b[i] + " ");

14.     }

15. }

a) Compile time error
b) 3, 4, 7, 8, 5
c) 3, 4, 7, 8, 5, 1, 2, 3, 4, 5
d) 4, 6, 10, 12, 5

Answer: d

Explanation: Passing of array parameters declared in main() and hence adding elements of array passed using param to another array k[] declared in fun() method.
Output : 4, 6, 10, 12, 5

6. What will be the output the of given set of code?

1.  static void Main(string[] args)

2.  {

3.      int [] a = {1, 2, 3, 4, 5};

4.      fun(a);

5.      Console.ReadLine();

6.  }

7.  static void fun(params int[] b )

8.  {

9.      for (int i = 0; i < b.Length; i++)

10.      {

11.          b[i] = b[i] * 5 ;

12.          Console.WriteLine(b[i] + "");

13.      }

14.  }

a) 1, 2, 3, 4, 5
b) 5, 10, 15, 20, 25
c) 5, 25, 125, 625, 3125
d) 6, 12, 18, 24, 30

Answer: b

Output : 5, 10, 15, 20, 25.

7. What will be the output of the given set of code?

1.  static void Main(string[] args)

2.  {

3.      int[] a = { 2, 21, 34, 46, 85, 88, 90};

4.      fun(a);

5.      Console.WriteLine(a + " ");

6.      Console.ReadLine();

7.  }

8.  static void fun(params int [] b )

9.  {

10.      int [] c = { 1, 2, 3, 4, 5, 6, 7};

11.      int i ;

12.      for (i = 0 ;i < b.Length ;i++)

13.      if (b[i] % 2 == 0)

14.      {

15.          c[i] = b[i];

16.      }

17.      Console.WriteLine("even numbers are:");

18.      for (i = 0 ;i <= b.Length ;i++)

19.      {

20.          Console.WriteLine(c[i]);

21.      }

22.  }

a) Compile time error
b) 2, 21, 34, 4, 6, 46, 88, 90
c) 2, 4, 34, 46, 6, 88, 90
d) 2, 34, 46, 88, 90

Answer: d

8. Select the correct declaration of the defining array of parameters:

a) void func(int[] x)
{

}
b) void func(int x)
{

}
c) void func(param int[])
{

}
d) void fun(param int[] x)
{

}

Answer: d

9. What will be the output of the given set of code?

1.  static void Main(string[] args)

2.  {

3.      int[] x = { 80, 82, 65, 72, 83, 67 };

4.      fun(x);

5.      Console.ReadLine();

6.  }

7.  static void fun(params int [] b )

8.  {

9.      int i;

10.      for (i = 5; i >=0 ; i--)

11.      {

12.          Console.WriteLine(Convert.ToChar(b[i]));

13.      }

14.  }

a) 67 83 72 65 82 80
b) P R A H S C
c) C S H A R P
d) 80 82 65 72 83 67

Answer: c

10. What will be the output of the given set of code?

1.  static void Main(string[] args)

2.  {

3.      int[] x = {65, 66, 67, 68, 69, 70};

4.      fun(x);

5.      Console.ReadLine();

6.  }

7.  static void fun(params int[] b )

8.  {

9.      int i;

10.      for (i = 5; i > 0 ; i--)

11.      {

12.          b[i] = b[i] + 32;

13.          Console.WriteLine(Convert.ToChar(b[i]));

14.      }

15.  }

a) A, B, C, D, E, F
b) F, E, D, C, B, A
c) f, e, d, c, b
d) b, c, d, e, f

Answer: c