netbenton

@echo off
:lop
cls
set /p n=输入你想计算的数字n=：
if %n% lss 0 goto :lop
if %n% gtr 999999999 goto :lop
for /l %%i in (1 1 %n%) do ( set /a sum=sum+%%i)
echo 1+2+....+n=%sum%
pause>nul
goto lop
复制代码

 
@echo off
:lop
cls
set /p n=输入你想计算的数字n=：
set /a v=n
if %v% neq %n% goto :lop
for /l %%i in (1 1 %n%) do ( set /a sum=sum+%%i)
echo 1+2+....+n=%sum%
pause>nul
goto lop
复制代码

[ 本帖最后由 netbenton 于 2009-6-2 20:15 编辑 ]