lilnq 1, C# - rextester

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//Rextester.Program.Main is the entry point for your code. Don't change it.
//Compiler version 4.0.30319.17929 for Microsoft (R) .NET Framework 4.5

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

namespace Rextester
{
    public class Program
    {
        public static void Main(string[] args)
        {
            Program p = new Program();
            p.linq9();
            //p.linq8();
            
        }
        public void linq9()
        {
            int[] numbers1 = { 0, 2, 4, 5, 6, 8, 9 }; 
            int[] numbers2 = { 1, 3, 5, 7, 8 }; 
            
            var pairs =
                from a in numbers1
                from b in numbers2
                where a < b
                select new {a , b};
            
            Console.WriteLine("Pairs where a < b:");
            foreach(var pair in pairs)
            {
               Console.WriteLine("{0} is less than {1}", pair.a, pair.b);
            }
            
            
        }
        /*This sample combines select and where to make a simple query that returns the text form of each digit less than 5.*/
        public void linq8()
        {
            int[] numbers = { 5, 4, 1, 3, 9, 8, 6, 7, 2, 0 }; 
            string[] digits = { "zero", "one", "two", "three", "four", "five", "six", "seven", "eight", "nine" };
            
            var numName = 
                from n in numbers
                where n > 5
                select digits[n];
            
            Console.WriteLine("Numbers > 5:");
            foreach (var x in numName)
            {
                Console.WriteLine("{0}", x);
            }
            
        }
        
        
        
        public void linq7()
        {
            int[] numbers = { 5, 4, 1, 3, 9, 8, 6, 7, 2, 0 }; 
            
            var numsInPlece = numbers.Select((num, index) => new {Num = num, InPlace = (num == index)});
            
            Console.WriteLine("Numbers in place");
            
            foreach(var n in numsInPlece)
            {
                Console.WriteLine("{0}:{1}", n.Num, n.InPlace);
                    
            }
        }
        public void linq6()
        {
            int[] numbers = { 5, 4, 1, 3, 9, 8, 6, 7, 2, 0 }; 
            string[] digitsName = { "zero", "one", "two", "three", "four", "five", "six", "seven", "eight", "nine" };
            
            var result = 
                from n in numbers
                select new {digit = digitsName[n], Even= ((n % 2)==0)};
            
            foreach(var d in result)
            {
                Console.WriteLine("Digit: {0} is {1}", d.digit, d.Even?"Even":"Odd");
            }
                
        }
          
        
        
        
        
        public void linq5()
        {
            string[] fruts = { "aPPLE", "BlUeBeRrY", "cHeRry" };
            
            var upperLowerWords =
                from w in fruts
                select new{ Upper = w.ToUpper(), lower = w.ToLower() };
            
            foreach(var f in upperLowerWords)
            {
                Console.WriteLine("upper:{0}, lowercase:{1}", f.Upper, f.lower);
            }
            
        }
        
        
        
        
        
        public void linq4()
        {
            int[] numbers = { 5, 4, 1, 3, 9, 8, 6, 7, 2, 0 };
            string[] strings = { "zero", "one", "two", "three", "four", "five", "six", "seven", "eight", "nine" };
            
            var textNums =
                from n in numbers
                select strings[n];
            
            Console.WriteLine("Number strings");
            foreach(var s in textNums)
            {
                Console.WriteLine(s);
            }
        }
        
        
        public void linq3()
        {
            int [] numbers =  { 5, 4, 1, 3, 9, 8, 6, 7, 2, 0 }; 
            
            var numsPlusOne=
                from n in numbers
                select n + 1;
            Console.WriteLine("Numbers plus 1");
            
            foreach (var i in numsPlusOne)
            {
                Console.WriteLine(i);
            }
        }
        public void linq2()
        {
            String[] digits ={ "zero", "one", "two", "three", "four", "five", "six", "seven", "eight", "nine" };
            var shortDigits = digits.Where((digit, index) => digit.Length < index);
            
            var shortD = digits.Where((digit, index) => digit.Length < index);
            Console.WriteLine("Short digits:");
            
            foreach (var x in shortD)
            {
                Console.WriteLine("The word {0} is shorter than its value", x);
            }
             
            
            
        }
        
        public void linq1()
        {
            int[] numbers = {1, 3, 4, 8, 9, 7, 4, 5, 6, 3, 2, 8, 10};
            
            var lowNuns = from n in numbers where n < 5 select n;
            
            Console.WriteLine("Lower than 5");
            
            foreach (var x in lowNuns)
            {
              Console.WriteLine(x);   
            }
            
            var bigNums = from x in numbers where x >= 5 select x;
            
            Console.WriteLine("Gigger or equal than 5");
            
            foreach(var x in bigNums)
            {
                Console.WriteLine(x);
            }
            
        }
    }
}

Show compiler warnings [ + ] Show input
Compilation time: 0,19 sec, absolute running time: 0,14 sec, cpu time: 0,11 sec, average memory usage: 16 Mb, average nr of threads: 3