@echo off
for %%a in (1 2) do (
        set a=0
        call:a %%a
)
pause&exit
:a
set /a a+=%1
echo %a%和%1
if %a% leq 10 goto:a
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@echo off
for /f "tokens=1 delims=:" %%i in ('findstr /n .* a.txt') do set num1=%%i
for /f "tokens=1 delims=:" %%i in ('findstr /n .* b.txt') do set num2=%%i
if %num1% geq %num2% (goto start) else (
        ren a.txt c.txt
        ren b.txt a.txt
        ren c.txt b.txt
)
:start
set line=-1
for /f "delims=" %%a in (a.txt) do call:b "%%a"
pause&exit
:b
set c=
set/a line+=1
(for /f "delims=" %%a in ('more +%line%^<b.txt') do (
        set c==
        echo %~1
        echo %%a
        if defined c goto:eof 
))>>c.txt
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