539956485

@echo off
set num=0
:main
set /p n=请输入最终要累加到的数
if n leq 1 goto error
for /l %%i in (1,1,%n%) do (set /a num=num+%%i )
echo sum=%num%
pause & exit
:error
echo 数字输入不能小于1
pause
cls
goto main 
pause
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