yhcfsr

@echo off
set /p "n=输入数字："
for /l %%i in (0,1,%n%) do set /a "sum+=%%i"
echo %sum%
pauseCOPY

yhcfsr

@echo off
set /p "n=输入数字："
for /l %%i in (0,1,%n%) do set /a "sum+=%%i"
echo %sum%
pauseCOPY