The SET statement in Batch Script and Loop Variable

Some Facts:

• The set statement is used to declare and initialize a variable.
• The variable initialization inside quote is considered best practice.
• The replaceable parameter is prefixed with % on command line window or %% in batch file. 
• Note that % is not both side of replaceable parameter as we do with variables declared with set statement.
• The replaceable parameters are part of loop implicit varibles.
• The SET statement is used to declare and initialize variable explicitly.
• The loop variable is implicitly declared.
• The SET variable can be of more than one letter but loop variable must be of single letter.

@echo off

set x=1222

set "y=234"

set "z=ajeet"

set "myVariable=Ram Krishna"

echo %x% %y% %z% %myVariable%

REM FOR /L implies for loop for a set of numbers

REM (1,3,44) implies (start,step,end) i.e. number between 1 and 44 and step value is 3

FOR /l %%n in (1,3,44) DO (echo %%n)

pause