@echo off
set /a zuo=0,shang=0,you=0,xia=0
setlocal enabledelayedexpansion
:refresh
set /a "a=%zuo%/2"
set /a "b=%shang%/2"
for /l %%i in (1,1,%b%) do echo a
for /l %%i in (1,1,%a%) do set/p=a <nul
ckey 0 37 38 39 40
if %errorlevel%==3 set /a zuo+=1
if %errorlevel%==4 set /a shang+=1
if %errorlevel%==1 set /a zuo-=1
if %errorlevel%==2 set /a shang-=1
cls
goto refresh
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