LINQ (Language-Integrated Query) in C Sharp MCQ question and answer with solution | C# Program MCQs

class Program
{
    static void Main(string[] args)
    {
        int[] nums = { 1, -2, 3, 0, -4, 5 };
        var posNums = nums.Where(n => n < 10).Select(r => r%3);
        Console.Write("The values in nums: ");
        foreach (int i in posNums) Console.Write(i + " ");
        Console.WriteLine();
        Console.ReadLine();
    }
}

class B { }
class A : B { }
class Program
{
    static void Main(string[] args)
    {
        A a = new A();
        B b = new B();
        if (a is A) 
        Console.WriteLine("a is an A");
        if (b is A)
        Console.WriteLine("b is an A because it is derived from A");
        if (a is B)
        Console.WriteLine("This won’t display -- a not derived from B");
        Console.ReadLine();
    }
}