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

interface i1
{
    void f1();
}
interface i2 :i1
{
    void f2();
}
public class maths :i2
{
    public void f2()
    {
        Console.WriteLine("fun2");
    }
    public void f1()
    {
        Console.WriteLine("fun1");
    }
}
class Program
{
    static Void Main()
    {
        maths m = new maths();
        m.f1();
        m.f2();
    }
}

namespace ConsoleApplication4
{   
    abstract class A 
    {
        public int i;
        public abstract void display();
    }    
    class B: A 
    {
        public  int j;
        public int sum;
        public override void display() 
        {
            sum = i + j;
            Console.WriteLine(+i + "\n" + +j);
            Console.WriteLine("sum is:" +sum);
        }
    }    
    class Program
    {
        static void Main(string[] args)
        {
            A obj = new B();
            obj.i = 2;
            B obj1 = new B();
            obj1.j = 10;
            obj.display();
            Console.ReadLine();
        }
    }
}

 class maths
 {
     public int length;
     public int breadth;
     public maths(int x, int y)
     {
         length = x;
         breadth = y;
         Console.WriteLine(x + y);
     }
     public maths(double x, int y)
     {
         length = (int)x;
         breadth = y;
         Console.WriteLine(x * y);
     }
 }
class Program
{
    static void Main(string[] args)
    {
        maths m = new maths(20, 40);
        maths k = new maths(12.0, 12);
        Console.ReadLine();
    }
}

static void Main(string[] args)
{
    int x = 4 ,b = 2;
    x -= b/= x * b;
    Console.WriteLine(x + " " + b);
    Console.ReadLine();
}

class z
{
    public string name1;
    public string address;
    public void show()
    {
        Console.WriteLine("{0} is in city{1}", name1, " ", address);
    }
}
class Program
{
    static void Main(string[] args)
    {
        z n = new z();
        n.name1 = "harsh";
        n.address = "new delhi";
        n.show();
        Console.ReadLine();
    }
}