keen

@echo off
:start
cls
set /p year=please input year:
set /a a=%year%%%4
set /a b=%year%%%100
set /a c=%year%%%400
if %c%==0 echo. &echo %year% is Leap Year! &echo. & pause & goto start
if %a%==0 (goto next) else (goto norn)
:next
if not %b%==0 (echo. & echo %year% is Leap Year! & echo. & pause & goto start) else (goto norn) 
:norn
echo.
echo %year% is not Leap Year!
echo.
pause
goto :start
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