testing_editor, C#

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

namespace Rextester
{
    public class Program
    {
        public static void Main(string[] args)
        {
            //variables are declared once and can be changed
            
            //Naming of variables
            //start with letter
            //followed by number or underscore
       
            
            //Constants are declared once and cannot be changed later
            const int A_CONST_INT = 100;
            
            //integer
            //ints by default are 32 bit
            int anInt = 1;
            const int THE_CONST INT = 2;
            
            //-----------------------------------------------------------------------------------------------------//
            //8 bit versions of an Int
            //byte
            //unsigned by default
            //range is 0 to 255
            byte myByte = 120;
            const MY_CONST_BYTE = 255;
            
            //16 bit  version of an Int
            //Short
            //range is -32,768 to 32,767
            //signed by default
            short myShort = 32000;
            const short MY_CONST_Short = -32000;
            
            //64 bit version of an Int
            //Long
            //range-9.2X10^18 to 9.2X10^18
            long mylong = 323232432342;
            const long MY_CONST_LONG = 3241321312313;
            //-------------------------------------------------------------------------------------------------------//
            //unsigned version
            
            //uint, ulong, ushort
            
            //float
            //ends with f otherwise it will assume its a double
            //accurate to 7 decimal units
            float aFLOAT = 2.23f;
            
            //double
            //64 bits decimals
            //accurate to 15-16 decimal units
            const double MY_DOUBLE = 12.23424;
            
            //char
            //they hold a value at a time
            //letter to a symbol
            char myChar = 'a';
            const char MY_CONST_CHAR = '_';
            
            //boolean
            //bool holds the value of trye or false
            bool myBool = true;
            const MY_CONST_BOOL = false;
            
        }
    }
}

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Compilation time: 0.42 sec, absolute service time: 0,49 sec