C# Test 3

Question 2: Which of the following type escapes type checking at compile-time; instead, it resolves type at run time?

• dynamic
• var
• undefined
• null

Question 3: What will be the output of the following program?

public static void Main()
{
	var x;
	x=100;
	Console.WriteLine(x); 
}

• 100
• 0
• Compile-time error
• Runtime error

Question 4: Which of the following data type should be used for monetary value?

• Long
• Float
• Double
• Decimal

Question 5: What will be the output of the following program?

public static void Main()
{
    float f = 10.12f;
    long l = 200L;

    Console.WriteLine(f+l);
}

• 210
• 210.12
• Compile-time error
• Runtime error

Question 6: What will be the output of the following program?

public static void Main(string[] args)
{
    int i = 2;
	   
 	Console.Write(++i);  
	Console.Write(i++);
	Console.Write(i);  
}

• 445
• 244
• 334
• 345

Question 7: A constructor can be _________.

• public
• private
• protected
• All of the above

Question 8: Which of the following is the default access modifier of the class members?

• Public
• Private
• Internal
• Protected internal

Question 9: Which of the following statements is TRUE?

• A readonly field can be initialized either at the declaration or in a constructor.
• A readonly field can be initialized either at the declaration or in a constructor or static methods.
• A readonly field can only be initialized in a constructor.
• A readonly field can only be initialized at the declaration.

Question 10: What will be the output of the following program?

public static void Main(string[] args)
{
	string str1 = "Hi";
	string str2 = String.Copy(str1);
		
	Console.Write(Object.ReferenceEquals(str1, str2));
}

• True
• False
• Exception
• null

Question 11: What will be the output of the following program?

for (double d = 1.01D; d < 1.05; d+= 0.01D)
{
    Console.Write("{0}, ", d);
}

• Compile-time error
• Runtime error
• 1.01, 1.02, 1.03, 1.04,
• 1, 1, 1, 1

Question 12: What will be the output of the following program?

public class Program
{
	public static void Main()
	{
		WorkingDays.Wednesday= 5;
		Console.Write(WeekDays.Wednesday);
	}
}

enum WorkingDays
{
    Monday,
    Tuesday,
    Wednesday,
    Thursday,
    Friday
}

• 5
• Wednesday
• Compile-time error
• Runtime error

Question 13: What will be the output of the following program?

public class Program
{
	public static void Main()
	{
		Console.Write((int)Color.Green);
	}
}
enum Color 
{
    Red,
    Green=0,
    Blue=0
}

• Compile-time error
• Runtime error
• 0
• Green

Question 14: Which of the following statement is correct bout the structure (struct)?

• Structure is a value type.
• Memory for the structure is allocated on the heap.
• Structure is useful to store large about of data.
• Structure can include a constructor and methods.

Question 15: What will be the output of the following program?

public static void Main(string[] args)
{
	Point p;
	p.x=10;
	Console.Write( p.x);
}

struct Point
{
	private int _x;
	public int x{
        get{
            return _x;
        }

        set{
            _x = value;
        }
}

• 0
• 10
• Compile-time error
• Runtime error

Question 16: Which of the following array declaration is valid?

• int[] arr = new int[5];
• int[,] arr1 = new int[5,2];
• int[][,] arr2 = new int[5][,];
• All of the above

Question 17: What will be the output of the following program?

HashSet hs = new HashSet(){
    1,1,2,3,3
};

foreach(var val in hs)
    Console.Write(val);

• 11233
• 123
• Compile-time error
• Runtime error

Question 18: What will be the output of the following program?

public static void Main()
{
    int[] arr = {1, 2, 3, 4, 5};
		
    try{
        Console.Write(arr[10]);
    }
	catch(Exception ex){
		Console.WriteLine("Error occurred!");
	}
	catch(IndexOutOfRangeException  ex){
        Console.WriteLine("Index error occurred!");
    }
    catch(NullReferenceException  ex){
        Console.WriteLine("Null error occurred!");
    }
}

• Error occurred!
• Index error occurred!
• Error occurred!
• Compile-time error

Question 19: What will be the output of the following program?

public static void Main()
{
	int[] arr = {1, 2, 3, 4, 5};
	
    try{
        Console.Write(arr[10]);
    }
	finally{
		Console.WriteLine("Error occurred!");
	}
}

• Compile-timer error
• Error occurred!
• Error occurred!
  Run-time exception: Index was outside the bounds of the array.

Question 20: The finally block is always executed irrespective of whether an exception occurs or not.

• True
• False