4.2 Casting, C# - rextester

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//4.2 Casting

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text.RegularExpressions;

namespace Rextester
{
    public class Program
    {
        public static void Main(string[] args)
        {
            //Casting is converting one type to another, speaking simply.
            //Only some types can be converted to any given type
            int a = 5;
            bool b = true;
            //a = (int)b; //nope
            long l = 15;
            l = (long)a;
            double d = 5.5;
            l = (long)d;
            Console.WriteLine(l);
            
            Apple apple = new Apple();
            Fruit fruit = new Fruit();
            //apple = (Apple)fruit; //nope, Fruit is not an Apple
            fruit = (Fruit)apple;
            Console.WriteLine(fruit.GetMyName());
            
            //checking whether can convert
            var fr = new Fruit();
            var ap = new Apple();
            Console.WriteLine(fr as Apple == null); //can't
            Console.WriteLine(ap as Fruit == null); //can
        }
    }
    public class Fruit
    {
        public void EatMe()
        {
            Console.WriteLine("Eating...");
        }
        public string GetMyName()
        {
            return "Some fruit";
        }
    }
    public class Apple : Fruit
    {            
        public string GetMyName()
        {
            return "Apple";
        }
    }
}

Show compiler warnings [ + ] Show input
Compilation time: 0.09 sec, absolute running time: 0.08 sec, cpu time: 0.06 sec, average memory usage: 16 Mb, average nr of threads: 4