1
36
39
2
46
39
3
48
86
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@echo off&setlocal enabledelayexpansion
(for /f "delims=" %%a in (a.txt) do (
        set /a n+=1
        if !n!==3 (
                set "n=0"
                echo;%%a
        ) else (
                set /p"=%%a,"
        )
))<nul
pause
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@echo off
set n=3
(for /f "delims=" %%a in (a.txt) do (
	set /a "1/!(n-=1),n=3"&&echo;%%a||set /p"=%%a,"
))<nul 2>nul
pause
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@echo off
(for /l %%a in () do (
setlocal enabledelayedexpansion
for /l %%a in (0 1 2) do set /p str[%%a]=
if not defined str[0] pause&exit
echo !str[0]!,!str[1]!,!str[2]!
endlocal
))<a.txt
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