China DOS Union

High school mathematics book required three actually learns programming... Helpless... Happy. Many math problems I can't do with bat, very unhappy, so I chose a better one. 1+2+3...100 seems simple, but still need to use some skills. Directly using set /a n=(1+100)*100/2 is too boring. Wrote the code

@echo off
set a=0
set b=0
:a
echo.+%a%=%b%
set /a a+=1
set /a b=%b%+%a%
if %a% gtr 100 (pause) else (goto :a)
exit

::Combined with for
@echo off
setlocal ENABLEDELAYEDEXPANSION
set b=0
for /l %%a in (1,1,100) do (
set /a b=%%a+!b!
echo %%a !b!
)
pause

\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\This is more visual sense

@echo off
set /a a=1,b=0
:a
set b=%b%+%a%
set /a a+=1
echo %b%
ping -n 1 127.0>nul
cls
if %a% gtr 100 (goto :b) else (goto :a)
:b
set /a c=%b%
echo.%b%=%c%
pause

\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\2

@echo off
set /a a=1,b=0
:a
set b=%b% +%a%
set /a a+=1
echo %b%
cls
if %a% gtr 100 (goto :b) else (goto :a)
:b
set /a c=%b%
echo.%b%=%c%
pause

This is a good example for a newbie like me to learn for and set!

cn-dos forum saw many good batch renaming batch processing, but the experts all used set... I don't understand, so I made one that I can understand, but the efficiency is relatively low. I didn't use the set command!

\\\\\\\\\\\\\\\\\\\\\\\\\\Batch Rename 1.bat \\\\\\\\\\\\\\\ (Rename to 1 2 3...10 11, etc.)

@echo off
ren *.jpg *.[jpg]
for /l %%a in (1,1,10000) do (
ren *.[jpg] final-%%a.jpg
if not exist *.[jpg] cls &color 0b &echo OK!! &pause &exit
)

\\\\\\\\\\\\\\\\\\\\\\\\\\Batch Rename 2.bat \\\\\\\\\\\\\\\ (Rename to 001 002 003..., etc.)

@echo off
ren *.jpg *.[jpg]
for %%a in (0 1 2 3 4 5 6 7 8 9) do (
for %%b in (0 1 2 3 4 5 6 7 8 9) do (
for %%c in (0 1 2 3 4 5 6 7 8 9) do (
color %%b%%c
ren *.[jpg] final-%%a%%b%%c.jpg
if not exist *.[jpg] cls &color 0b &echo OK!! &pause &exit
)
)
)


\\\\\\\\\\\\\\\\\\\\\\\\\Final Batch Rename.bat \\\ (Can choose the type, file type, start of the rename sequence, such as a001, a002)

::If there are deficiencies (that can be improved), welcome to complain or correct hi.baidu.com/523066680

@echo off
mode con cols=77 lines=12
title A batch processing beginner hi.baidu.com/523066680
color 0b

::======================================================================

echo.
echo.Step 1: Enter the beginning of the new file name here, you can directly press Enter (that is, rename to 000 001 002) or (0 1 2)
echo. If you enter a, it will be renamed to a000 a001 a002..... or a0 a1 a2......
echo.
echo.Special symbols ^> ^< ^\ ^/ ^? ^" ^: ^| ^* are not supported. Do not enter spaces after entering the name. This batch processing does not judge.
echo.
set /p no1=Please enter:

::======================================================================

cls
echo.
echo.Step 2: Enter the format of the file to be renamed here
echo.
echo.
echo.Special symbols ^> ^< ^\ ^/ ^? ^" ^: ^| ^* spaces are not supported, or directly press Enter. This batch processing does not judge. &echo.
set /p no2=Please enter:
if not exist *.%no2% (cls &echo There is no file in %no2% format, please enter correctly, press any key to exit &pause>nul &exit)
if /i %no2%==bat (cls &echo Renaming bat format files is not supported (this file will be renamed, resulting in....) &pause &exit)
cls

::======================================================================

:Second
cls
echo.When executing, if it shows "There is a duplicate file or the file is not found", please do not close it immediately, wait for execution
echo.
echo.Select mode a: Rename to 000 001 002, limited to 999 files (can be changed)
echo.Select mode b: Rename to 1 2 3 4 5 ...., limited to 10000 files (can be changed)
echo.
set /p action="Enter here:"
if /i "%action%"=="a" (goto :ren1-1)
if /i "%action%"=="b" (goto :ren2-1) else (goto :second)

::======================================================================


:ren1-1
cls
ren *.%no2% *.[%no2%]

for %%a in (0 1 2 3 4 5 6 7 8 9) do (
for %%b in (0 1 2 3 4 5 6 7 8 9) do (
for %%c in (0 1 2 3 4 5 6 7 8 9) do (
color %%b%%c &title %%a%%b%%c.%no2%
echo. %no1%%%a%%b%%c.%no2%
ren *.[%no2%] %no1%%%a%%b%%c.%no2%>nul 2>nul
if not exist *.[%no2%] cls &color 0b &echo OK!! &pause &exit
)
)
)

::=======================================================================

:ren2-1
ren *.%no2% *.[%no2%]
for /l %%a in (1,1,10000) do (
echo. %no1%%%a%no2%
ren *.[%no2%] %no1%%%a.%no2%>nul 2>nul
if not exist *.[%no2%] cls &color 0b &echo OK!! &pause &exit
)

FOR /L %variable IN (start,step,end) DO command [command-parameters]

This set represents a sequence of numbers from start to end in increments.
Therefore, (1,1,5) will generate the sequence 1 2 3 4 5, and (5,-1,1) will generate the sequence (5 4 3 2 1).

It's too boring to just use set /a n=(1+100)*100/2.

Sweat～
The best algorithm... the fastest.

Hehe... The spirit of exploration is indispensable... Clearly knowing there is a simple one, but still wanting to do other methods

```batch
@echo off
set aa=0
for /l %%a in (1,1,100) do (
call :aaa %%a
)
pause
goto :eof
:aaa
set /a aa=%1+%aa%
echo %aa%
```

The code upstairs is so flexible... I'll learn it.

@echo off
for /l %%a in (1,1,100) do set /a a+=%%a
echo %a%
pause

Learned... Feeling ashamed... But still learned!

I want to make the code on floor 11 more visual, but there's a strange phenomenon
@echo off
for /l %%a in (1,1,100) do (
set /a a+=%%a
echo.%a%
)
pause

It has been modified again... It's okay
@echo off
setlocal ENABLEDELAYEDEXPANSION
for /l %%a in (1,1,100) do (set /a a+=%%a &echo !a!)
pause

I can't understand the code on the ninth floor... Who is willing to explain it? Thanks here

Why is everyone leaving me... Teach me!