a590687

早上就是有灵感.

@echo off&setlocal enabledelayedexpansion
:lp
set sun=0
set /p a=请输入要从1加到几:
for /l %%i in (1,1,%a%) do (
    set /a sun+=%%i
    )
set/p=!sun!<nul
echo.
goto lp
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