C# Programming Mock Test 8

1. Select the Keyword which supports the run time type identification?

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

class Program
{
    static void Main(string[] args)
    {
        string[] strs = {"alpha", "beta", "gamma"};
        var chrs = from str in strs
                   let chrArray = str.ToCharArray()
                   from ch in chrArray
                   orderby ch
                   select ch;
        Console.WriteLine("The individual characters in sorted order:");
        foreach (char c in chrs) 
        Console.Write(c + " ");
        Console.WriteLine();
        Console.ReadLine();
    }
}

3. A HashTable t maintains a collection of names of states and capital city of each state. Which among the following finds out whether "New delhi" state is present in the collection or not?

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

  static void Main(string[] args)
  {
      string[] strings = {"beta", "alpha", "gamma"};
      Console.WriteLine("Array elements: ");
      DisplayArray(strings);
      Array.Reverse(strings); 
      Console.WriteLine("Array elements now: ");
      DisplayArray(strings);
      Console.ReadLine();
   }
   public static void DisplayArray(Array array)
   {
       foreach (object o in array)
       {
           Console.Write("{0} ", o);
       }
           Console.WriteLine();
   }
 

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

class A {}
class B : A {}
class CheckCast 
{
    static void Main() 
    {
        A a = new A();
        B b = new B();
        b = a as B;
        b = null;
        if(b==null)
        Console.WriteLine("The cast in b = (B) a is NOT allowed.");
        else
        Console.WriteLine("The cast in b = (B) a is allowed");
    }
}

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

 class Program
 {
     static void Main(string[] args)
     {
         double x = 4.772;
         double y = 4.76;
         double z = Math.Max(x, y);
         Console.WriteLine(z);
         Console.ReadLine();
     }
 }

7. Assume 2 columns named as Product and Category how can be both sorted out based on first by category and then by product name?

8. In the following C# code, what does the output represent?

class Program
{
    static void Main(string[] args)
    {
        int[] nums = { 1, -2, 3, 0, -4, 5 };
        var posNums = from n in nums
                      where n > 0
                      select n;
        int len = posNums.Count();
        Console.WriteLine(len);
        Console.ReadLine();
    }
}

9. In the following C# code, which statements are perfectly valid?

public class Csharp
{
    public void subject<S>(S arg)
    {
        Console.WriteLine(arg);
    }
}
class Program
{
    static Void Main(string[] args)
    {
        Csharp c = new Csharp();
        c.subject("hi");
        c.subject(20);
    }
}

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

 class Program
 {
     static void Main(string[] args)
     {
         int[] nums = { 1, -2, 3, 0, -4, 5};
         var posNums = from n in nums
                       where n >= 0
                       select n;
        foreach (int i in posNums) 
        Console.Write(i + " ");
        Console.WriteLine();
        Console.ReadLine();
    }
}