1.1 Basics: language constructs, C#

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//1.1 Basics: language constructs

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

namespace Rextester
{
    public class Program
    {
        public static void Main(string[] args)
        {
            //if
            if(5>3)
            {
                Console.WriteLine("first");
            }
            else
            {
                Console.WriteLine("second");
            }
            
            //switch
            int a = 5;
            switch(a)
            {
                case 1:
                    Console.WriteLine("one");
                    break;
                case 5:
                    Console.WriteLine("five");
                    break;
                default:
                    break;
            }
            
            //C-style for
            List<int> list = new List<int>() {1,2,3};
            for(int i=0; i<list.Count(); i++)
            {
                Console.Write("{0} ", list[i]);
            }
            
            //foreach
            Console.WriteLine();
            foreach(int item in list)
            {
                Console.Write("{0} ", item);
                //list.Add(7); //can't modify collection you are iterating through! If you need that use C-style for
            }
            
            //Linq-style foreach
            Console.WriteLine();
            list.ForEach(f => Console.Write("{0} ", f)); //ok, that's not basic construct and it will be talked about later, however id does the same as above
            
            //while
            Console.WriteLine();
            while(list.Count() > 0)
            {
                Console.Write("{0} ", list.Count());
                list.RemoveAt(0);
            }
            
            
            //Conditional statement 
            Console.WriteLine();
            Console.WriteLine(5 > 3 ? "yes" : "no"); //short equivalent to if(5>3) return "yes" else return "no" 
            
        }
    }
}

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Compilation time: 0.09 sec, absolute running time: 0.08 sec, cpu time: 0.08 sec, average memory usage: 16 Mb, average nr of threads: 4