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@ echo off
for /l %%i in (1,1,100) do (set /a sum+=%%i)
echo 从1到100的数字之和是：%sum%
pause>nul
set sum=0
set /p input=随意输入壹个数字：
for /l %%i in (1,1,%input%) do (set /a sum+=%%i)
echo 从1一直加到你输入的数字之和是：%sum%
pause>nul
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