Lumiere

@echo off
:start
set /p a=Please input the year!:
set /a x=%a%%%4 
set /a y=%a%%%100 
set /a z=%a%%%400
if %z% equ 0 goto leap
if %x% equ 0 (if %y% neq 0 goto leap else goto warning) else goto leap
:warning
echo The year you inputted is not leap year. Please input again!
goto start
:leap
echo The year you inputted is leap year!
pause
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[ 本帖最后由 Lumiere 于 2009-3-23 19:10 编辑 ]