Linq, C# - rextester

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//Title of this code
//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)
        {

int[] nums = { 1, -2, 3, 0, -4, 5 };
                // Create a query that obtains only positive numbers.
    
             var posNums = from n in nums
            
             where n > 0
            
             select n;
            
             Console.Write("The positive values in nums: ");
            
             // Execute the query and display the results.
            
             foreach(int i in posNums) Console.Write(i + " ");
            
             Console.WriteLine();
             Console.WriteLine("\nSetting nums[1] to 99.");

nums[1] = 99;
            
             Console.Write("The positive values in nums after change: ");
            
             // Execute the query a second time.
            
             foreach(int i in posNums) Console.Write(i + " ");
            
             Console.WriteLine();
        }
    }
}

Show compiler warnings [ + ] Show input
Compilation time: 0.14 sec, absolute running time: 0.11 sec, cpu time: 0.09 sec, average memory usage: 16 Mb, average nr of threads: 4