C# Test 4

Question 2: What will be the output of the following program?

public static void Main()
{
	var i=10, j=2, k=3;
	Console.WriteLine(k=i*j); 
}

• 20
• 60
• 0
• Compile-time error

Question 3: What is the difference between var and dynamic type?

• The actual type of var resolves at runtime, whereas the type of dynamic type resolves at compile-time.
• The actual type of var resolves at compile-time, whereas the type of dynamic type resolves at runtime.
• var is mutable, whereas dynamic is immutable.
• Both are same, no differences.

Question 4: If you want to hold a positive integer value up to 250. Which of the following data type will you use for a variable?

• uint
• ushort
• byte
• sbyte

Question 5: What will be the output ofConsole.WriteLine(Convert.ToInt32('A'));?

• Compiler Error
• Runtime Error
• 65
• Garbage value

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

IList nums = null;
Console.Write(nums?[0]);

• Compile-time error
• Runtime error
• Blank output
• System.Int32

Question 7: Which of the following keyword is used to reference two assemblies with the same fully qualified type names?

• using
• alias
• extern alias
• extern

Question 8: Which of the following statements is TRUE?

• Constant can be initialized at the time of declaration or inside a constructor.
• Constant can be initialized in the static method.
• Constants must be initialized at the time of declaration.
• None of the above.

Question 9: What will be the output of the following program?

public static void Main(string[] args)
{
    test();     
}
	
void test(){
	Console.Write("test()");
}

• test()
• Compiler Error
• Runtime Error
• No output

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

class Program
{
    static void Main()
    {
        Person p = new Person() {
                Id = 1
        };

        Console.Write(p.ToString());
    }
}

class Person
{
	public int Id;

	public override string ToString() => this.Id.ToString();
}

• Compile-timer error
• Runtime error
• 0
• 1

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

public static void Main()
{
	while (DoSomething());
}
	
static bool DoSomething() {
	Console.Write("working");
	return false;
}

• Compile-time error
• Runtime error
• working
• Blank output

Question 12: An enum cannot be declared inside a method.

• True
• False

Question 13: Which of the following statements are TRUE?

• Enum is a value type.
• Enum is derived from the Object class.
• The default data type of enum members is int.
• String cannot be used with enum.
• Enum can be declared in a method.

Question 14: What will be the output of the following program?

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

		
struct Point
{
	public int x;
}

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

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

public class Program
{
	public static void Main()
	{
		int i = 3;
		int[] arr = new int[i] {10, 20, 30};

		Console.Write(arr[0]);
	}
}

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

Question 16: 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!");
        }
        finally
        {
            Console.WriteLine("Executing finally block");
        }
	
		Console.WriteLine("Executing remaining program");
}

• Error occurred!
• Error occurred!
  Executing finally block
• Error occurred!
  Executing finally block
  Executing remaining program
• Executing finally block

Question 17: Which of the following statement is TRUE?

• An event is an encapsulated delegate.
• An event is a callback method.
• An event is a static method.
• None of the above

Question 18: How would you declare an event for the following delegate?

	public delegate void ClickHandler();

• public ClickHandler OnClick;
• public event ClickHandler OnClick;
• public event void OnClick;
• public ClickHandler event OnClick;

Question 19: Which of the following keyword is used to raise an exception manually?

• raise
• return
• throw
• error

Question 20: How to pass a function as a parameter in C#?

• Cannot pass a function as a parameter in C#.
• Using pointer.
• Using dynamic parameter type.
• Using delegate.