Classes and Objects in C Sharp MCQ question and answer with solution | C# Program MCQs

static void Main(string[] args)
{
    m();
    Console.ReadLine();
}
static void m()
{
    Console.WriteLine("HI");
    m();
}

public class maths
{
    public int x;
    public virtual void a()
    {

    }

}
public class subject : maths
{
    new public void a()
    {

    }

}

{
    struct abc
    {
        public int i;
    }  
    class Program
    {
        static void Main(string[] args)
        {
            sample a = new sample();
            a.i = 10;
            fun(ref a);
            Console.WriteLine(a.i);
        }
        public static voidn fun(ref sample x)
        {
            x.i = 20; 
            Console.WriteLine(x.i);
        }
    }
}

class maths 
{
    int fact(int n) 
    {
        int result;
        if (n == 1)
        return 1;
        result = fact(n - 1) * n;
        return result;
    }
} 
class Output 
{
    static void main(String args[]) 
    {
        maths obj = new maths() ;
        Console.WriteLine(obj.fact(1));
    }
}

interface a1
{
    void f1();
    void f2();
}
class a :a1
{ 
    private int i;
    void a1.f1()
    {
    }
 }