@echo off
set n=1
set /p n=input a number!
for /l %%i in (1,1,%n%) do (
    set /a sum+=%%i
)
echo %sum%
pause
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echo %n%|findstr "^[1-9][0-9]*$">nul
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for /l %%i in (1,1,%n%) do (
    set /a sum+=%%i                  

for循环增加数字并且增加的数字相加 （1，1，%n%）中第一个1表示开始的数字，第二个表示以一个单位（即1，2，3，4....）这样子逐个增加，%n%结束的数字（就是用户输入的数字）set  /a=sum+=%%i  就是将循环的数字互相增加~

echo %sum%       显示最后的总和（即所有数的和）

pause              按任意键继续~

@echo off&setlocal EnableDelayedExpansion
set a=0
set /p n=请输入:
for /l %%i in (1 1 %n%) do (
    set /a a+=%%i
echo !a!
)
pause>nul
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@echo off
set/p a1=头项
set/p a2=末项
set/p a3=相邻两个数之差

set /a n=(%a2%-%a1%)/%a3%+1
set /a n1=(%a1%+%a2%)*%n%/2
echo %n1%&pause

for /l %%a in (%a1% %a3% %a2%) do (set /a z+=%%a)
echo %z%&pause
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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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@echo off
:hk
set/p n=输入一个数：
set/a m=(1+%n%)*%n%/2
cls
echo %m%
goto hk
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@echo off
set /p n=请输入N:
set num=0
FOR /l %%i in (1 1 %n%) do (
set /a num+=%%i
)
echo 1+2+3+...+%n%=%num%
pause>nul 
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@echo off&setlocal EnableDelayedExpansion
set /p num=请输入数字：
for /l %%a (1 1 %num%) do (
set /a n=n+%%a
)
echo 运算结果：!n!
pause>nul
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@echo off
set x=1
for /l %%a in (2,1,100) do (
set /a x=x+%%a
)
echo %x%
pause
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@echo off
set /p x=1+2+3+4+5+6+7+8+9+~~~~~:
set y=1
for /l %%a in (2,1,%x%) do set /a y=y+%%a
echo %y%
pause
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@echo off
:main
set aa=
setlocal enabledelayedexpansion
set /p n=请输入数字n:
for /l %%i in (1,1,%n%) do (
set /a aa=!aa!+%%i)
echo !aa!
pause>nul
goto :main
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@echo off
:main
set aa=
setlocal enabledelayedexpansion
set /p n=请输入数字n:
for /l %%i in (1,1,%n%) do (
set /a aa=!aa!+%%i)
echo !aa!
pause>nul
goto :main
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@echo off
set/p n=  input a number :
set/a s=n-1,s*=n/2,s+=n
echo %s%
pause
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@echo off
set /p n= 请输入最后一个数：
set /a sum=(1+%n%)*%n%/2
echo 总和：%sum%
pause
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set /p maxnum=input a number:
set /a sum=(%maxnum%+1)*%maxnum%/2
echo.
echo.
echo.
echo.%sum%
pause>nul
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@echo off
set /a result=0
set /p n=输入N的值:
for /l %%a in (1,1,%n%) do set /a result+=%%a
echo result=%result%
pause
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@echo off&setlocal enabledelayedexpansion
set /p n=请输入n的值：
set sum=0
for /l %%i in (1,1,!n!) do set /a sum=!sum!+%%i
echo %sum%
pause
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set /a 50*(100+1)
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::批处理计算1+2+3+4+...+100=?
::计算从1到100的数字之和
::要求：
::不能直接echo，必须用程序计算出结果；
@echo off
set var1=0
set /p var2=请输入最大数：
for /l %%a in (1 1 %var2%) do (set /a var1+=%%a) 
echo;%var1%
pause
@echo off
set var1=0
for /l %%a in (1 1 100) do (set /a var1+=%%a) 
echo;%var1%
pause
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@echo off
set /a sum=0
for /l %%i in (1,1,100) do (
set /a sum=sum+%%i
)
echo %sum%
pause
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@echo off
set /p n=输入N：
set /a sum=0
for /l %%i in (1,1,%n%) do (
set /a sum=sum+%%i
)
echo %sum%
pause
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@echo off
:star
set/p "b=请输入一个自然数："
echo %b%|findstr "^[1-9][0-9]*$ ^[0]$" >nul
if %errorlevel%==0 (
   for /l %%i in (0,1,%b%) do set/a sum+=%%i 
   call,echo %%sum%%
   ) else (cls&echo 输入错误！&goto star)       
pause
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@echo off 
set /p n=请输入数值:
for /l %%i in (0,1,%n%) do (
       set /a sum=sum+%%i
)
echo %sum%
pause
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@echo off
for /l %%a in (1,1,6) do set /a var+=%%a
echo %var%
pause
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@echo off
for /l %%a in (1,1,100) do set /a var+=%%a
echo %var%
pause
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set /a (1+100)*100/2
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@set /p n=请输入n:
@set /a n=(n+1)*n/2
@echo 结果:%n%&pause
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@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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@echo off
set /p n=请输入任意数字
echo 您输入的数字为：%n%
for /l %%i in (1 1 %n%) do set /a num+=%%i
echo 计算结果为：%num%
pause >nul
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@echo off
for /l %%i in (1,1,100) do (
set /a n+=%%i
)
echo %%n
pause
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@echo off
:a1
set /p n=input the last number! 
for /l %%a in (1,1,%n%) do set /a b=((%%a+1)*%%a)/2
echo %b%
pause
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@echo off
set /p n=请输入数字：
cls
set /a x=%n%*(1+%n%)/2
echo %x%
pause
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@echo off 
title=1+2+3+…+100=？
setlocal enabledelayedexpansion
for /l %%i in (1 1 100) do (
set /a sum+=%%i
)
echo 1+2+3+…+100=!sum!
pause>nul
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@ echo off
set /a num=(100+1)*(100/2)
echo,%num%
pause
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@ echo off
set /a num=1+2+3+4+...+100
echo %a%
pause
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@echo off    //关闭回显
set /a sum=0    //一开始总和为0
for %%i in(1,1,100) do (set /a sum++)  //循环100次对sum进行累加
call echo 总的结果是:%sum%     //输出最终结果
pause  //暂停
exit
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@echo off
:1
set con=0
set ds=0
set /p end=请输入要加到的值
::---------循环首----------
:start
set /a con+=1
set /a ds=%ds%+%con%
::---------循环尾----------
if %con%==%end% (echo 答案是:%ds%) else (
goto start
)
goto 1
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@echo off
SETLOCAL ENABLEDELAYEDEXPANSION
for /l %%a in ( 0 1 100 ) do (
 set ji=%%a
 set /a jia+=!ji!
)
echo !jia!
pause
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@echo off
set /p n=请输入：
set /a sum=(1+%n%)*%n%/2
echo 1加到%n%的和是%sum%
pause
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@echo off&setlocal enabledelayedexpansion
set a=0
for /l %%i in (1 1 100) do (
    set c=%%i
    set /a a=!a!+!c!
    cls&@echo !a!
)
pause
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@echo off
setlocal enabledelayedexpansion
for /l %%i in (1 1 100) do set /a b+=%%i
echo !b!
pause
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rem 此为第二个问题答案
@echo off
set /p a=请输入数值
for /l %%i in (1,1,%a%) do (
    set /a n+=%%i
)
echo %n%
pause
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@echo off
set /a var=0
for /l %%i in (1,1,100) do (
set /a var+=%%i
)
echo %var%
pause
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@echo off
SET N=0
SET /P M=INPUT A NUMBER
:START
SET /A N+=1
SET /A SUM+=%N%
IF %N% EQU %M% (ECHO %SUM%) ELSE goto START
PAUSE
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@echo off
set n=101
:loop
set /a n=n-1
set /a m+=n
if %n% neq 0 goto loop
echo %m%
pause
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@echo off
set t=0
for /l %%a in (1 1 100) do (
set/a t+=%%a
)
echo %t%
pause
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@echo off&setlocal enabledelayedexpansion
for /l %%i in (1,1,100) do set /a s+=%%i
echo !s!
pause
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@echo off&setlocal enabledelayedexpansion
set /p n=请输入数字：
for /l %%i in (1,1,!n!) do set /a s+=%%i
echo !b!
pause
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::从1加到100的
@echo off
set str=0
for /l %%i in (1,1,100) do (
    set /a str+=%%i
)
echo %str%
pause>nul
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::任意数值的计算
@echo off
set str=0
set /p var=input number

for /l %%i in (1,1,%var%) do (
    set /a str+=%%i
)
echo %str%
pause>nul
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@echo off
set /a sum=0
for /l %%a in (1 1 100) do (
set/a sum+=%%a
)
echo %sum%
set sum=
pause>nul
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@echo off
:abc
cls
set /a i = 1
set /p n=請輸入數字：
if {%n%}=={} goto abc
:acb
set /a i+=1,j+=i
if %i% neq %n% goto acb
echo %j%
pause
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@echo off
set var=0
for /l %%a in (1,1,100) do (set /a var=var+%%a)
echo 1+2+3+4+...+100=%var%
pause>nul
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@echo on&setlocal enabledelayedexpansion
set sum=0
for /l %%i in (1,1,100) do (set /a sum+=%%i)
echo 1+2+...+100=!sum!
pause
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