csharp Class Questions & Answers

Question 21: What will be the output of the following program?

public class Program
{
	public static void Main(string[] args)
 	{
		for(int i=0;i<2;i++)
			Printer.Print(i);
	}
}

public static class Printer
{
    static Printer()
    {
        Console.Write("-constructor-.");
    }

	public static void Print(object o)
    {
        Console.Write(o);
    }
}

Question 22: What will be the output of the following program?

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

Question 23: What will be the output of the following program?

class Program
{
    static void Main()
    {
        Person p = new Person() {
                FirstName = "James",
                LastName = "Bond"
        };

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

class Person
{
    public string FirstName { get; set; }
    public string LastName { get; set; }

    public override string ToString() => $"{FirstName} {LastName}";
}
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Question 24: What will be the output of the following program?

using static System.String;

class Program
{
    static void Main()
    {
        string str = null;
        Console.Write(IsNullOrEmpty(str));

        Console.ReadKey();
    }

}

Question 25: What does the following code do?

namespace Business
{
    public static class BusinessRules
    {
        public static bool Compare(this string str, string value)
        {
            return str == value;
        }
    }
}