C# Questions and Answers for Experienced

This set of C# Questions and Answers for Experienced people focuses on “Use of Variable Number of Arguments”.

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
View Answer

Answer: c
Explanation: None.

2. The modifiers used to define an array of parameters or list of arguments is __________
a) ref
b) out
c) param
d) var
View Answer

Answer: c
Explanation: None.

3. What will be the output of the following C# code?

```
 static void Main(string[] args)
```
```
 {
```

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

```
     fun(a);
```
```
     Console.ReadLine();
```
```
 }
```
```
 static void fun(params object[] b)
```
```
 {
```

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

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

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

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 :

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 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 are used to specify the syntax for a function having arguments
d) Omitting the return value type in method definition results into an exception
View Answer

Answer: b
Explanation: None.

5. What will be the output of the following C# code?

```
static void Main(string[] args)
```
```
{
```
```
    int [] a = {1, 2, 3, 4, 5};
```
```
    fun(a);
```
```
    Console.ReadLine();
```
```
}
```
```
static void fun(params int[] b )
```
```
{
```
```
    int[] k = { 3, 4, 7, 8,'\0' };
```
```
    for (int i = 0; i < b.Length; i++)
```
```
    {
```
```
        b[i] = b[i] + k[i] ;
```
```
        Console.WriteLine( b[i] + " ");
```
```
    }
```
```
}
```

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
View Answer

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 of the following C# code?

```
 static void Main(string[] args)
```
```
 {
```
```
     int [] a = {1, 2, 3, 4, 5};
```
```
     fun(a);
```
```
     Console.ReadLine();
```
```
 }
```
```
 static void fun(params int[] b )
```
```
 {
```
```
     for (int i = 0; i < b.Length; i++)
```
```
     {
```
```
         b[i] = b[i] * 5 ;
```
```
         Console.WriteLine(b[i] + "");
```
```
     }
```
```
 }
```

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

Answer: b
Explanation: None.
Output :

 5, 10, 15, 20, 25

7. What will be the output of the following C# code?

```
 static void Main(string[] args)
```
```
 {
```

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

```
     fun(a);
```
```
     Console.WriteLine(a + " ");
```
```
     Console.ReadLine();
```
```
 }
```
```
 static void fun(params int [] b )
```
```
 {
```
```
     int [] c = { 1, 2, 3, 4, 5, 6, 7};
```
```
     int i ;
```
```
     for (i = 0 ;i < b.Length ;i++)
```
```
     if (b[i] % 2 == 0)
```
```
     {
```
```
         c[i] = b[i];
```
```
     }
```

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

```
     for (i = 0 ;i <= b.Length ;i++)
```
```
     {
```
```
         Console.WriteLine(c[i]);
```
```
     }
```
```
 }
```

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
View Answer

Answer: d
Explanation: None.

8. Select the correct declaration of the defining array of parameters.
a)

   void func(int[] x) 
   {
    
   }

   void func(int x)
   {

   }

   void func(param int[])
   {
   
   }

   void fun(param int[] x)
   {
  
   }

View Answer

Answer: d
Explanation: None.

9. What will be the output of the following C# code?

```
 static void Main(string[] args)
```
```
 {
```

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

```
     fun(x);
```
```
     Console.ReadLine();
```
```
 }
```
```
 static void fun(params int [] b )
```
```
 {
```
```
     int i;
```
```
     for (i = 5; i >=0 ; i--)
```
```
     {
```

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

```
     }
```
```
 }
```

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
View Answer

Answer: c
Explanation: None.

10. What will be the output of the following C# code?

```
 static void Main(string[] args)
```
```
 {
```

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

```
     fun(x);
```
```
     Console.ReadLine();
```
```
 }
```
```
 static void fun(params int[] b )
```
```
 {
```
```
     int i;
```
```
     for (i = 5; i > 0 ; i--)
```
```
     {
```
```
         b[i] = b[i] + 32;
```

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

```
     }
```
```
 }
```

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
View Answer

Answer: c
Explanation: None.

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