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set  str=adadfdfseffserfefsefseetsdg

### 代码实现
```batch
@echo off
setlocal enabledelayedexpansion
set "str=adadfdfseffserfefsefseetsdg"
set "chars=a b c d e f g h i j k l m n o p q r s t u v w x y z"
set max_count=0
set max_char=
for %%c in (%chars%) do (
set count=0
for /l %%i in (0,1,100) do (
set "char=!str:~%%i,1!"
if "!char!"=="%%c" (
set /a count+=1
)
)
if !count! gtr !max_count! (
set max_count=!count!
set max_char=%%c
)
)
echo 出现次数最多的字母是：%max_char%，出现次数：%max_count%
endlocal
```

### 代码解释
1. `@echo off`：关闭命令回显，使脚本执行时不显示命令本身。
2. `setlocal enabledelayedexpansion`：启用延迟环境变量扩展，以便在循环中正确获取更新后的变量值。
3. `set "str=adadfdfseffserfefsefseetsdg"`：设置要处理的字符串。
4. `set "chars=a b c d e f g h i j k l m n o p q r s t u v w x y z"`：定义所有可能的字母。
5. `for %%c in (%chars%) do`：遍历每个字母。
6. `set count=0`：初始化每个字母的计数为0。
7. `for /l %%i in (0,1,100) do`：循环遍历字符串的每个字符（假设字符串长度不超过100）。
8. `set "char=!str:~%%i,1!"`：获取字符串中指定位置的字符。
9. `if "!char!"=="%%c" ( set /a count+=1 )`：如果当前字符与遍历的字母相同，计数加1。
10. `if !count! gtr !max_count! ( set max_count=!count! & set max_char=%%c )`：如果当前字母的计数大于最大计数，更新最大计数和对应的字母。
11. `echo 出现次数最多的字母是：%max_char%，出现次数：%max_count%`：输出出现次数最多的字母及其次数。
12. `endlocal`：结束局部环境，恢复之前的环境变量状态。

Actually, there is ready-made code available for plagiarism in this topic in the forum. Brother 3742668 did it before, and I also helped others answer in the Wuyou Boot Forum. I won't provide the code for now. You all can discuss it first ^_^.

Suggestion: set "str=`-=\;',./~%!@#o^&*()_+{}|:<>?"abc123ABC00"

This kind of consideration for special characters is a bit challenging, oh

Last edited by vkill on 2006-11-30 at 04:43 AM ]

There is a command called wc in Linux haha ha ha ha

@echo off

setlocal EnableDelayedExpansion

set str=adadfdfseffserfefsefseetsdg



:loop

set str$=%str$% %str:~0,1%

set str=%str:~1%

if not "%str%" == "" goto loop



for %%i in (%str$%) do call :Scan1 %%i



pause

exit



:Scan1

for %%i in (%exclude%) do if "%1"=="%%i" goto :eof

set exclude=%exclude% %1

call :Scan2 %1

goto :eof



:Scan2

for %%i in (%str$%) do if "%1"=="%%i" set /a %1+=1

echo %1 !%1!

goto :eof

Have a try^_^

@echo off

setlocal EnableDelayedExpansion

set str=adadfdfseffserfefsefseetsdg



:loop

set str$=%str$% %str:~0,1%

set str=%str:~1%

if not "%str%" == "" goto loop



for %%i in (%str$%) do call :Scan1 %%i



pause

exit



:Scan1

for %%i in (%exclude%) do if "%1"=="%%i" goto :eof

set exclude=%exclude% %1

call :Scan2 %1

goto :eof



:Scan2

for %%i in (%str$%) do if "%1"=="%%i" set /a %1+=1

echo %1 !%1!

goto :eof

Last edited by zxcv on 2006-11-29 at 01:31 AM ]

set str$=%str$% %str:~0,1%

set str=%str:~1%

……

for %%i in (%str$%) do call :Scan1 %%i

Brother zxcv, the code on floor 5 is interesting~ Appreciate it~~~

set str$=%str$% %str:~0,1%

set str=%str:~1%

……

The above first "breaks down" the string in the str variable "adadfdfseffserfefsefseetsdg" into individual characters separated by spaces, for the convenience of the for loop to take character values one by one~ : )

(This technique of breaking down a continuous string into individual letters separated by spaces is very interesting~ : )

for %%i in (%str$%) do call :Scan1 %%i

When the string has been "broken down" into individual letters each separated by a space, it reads them one by one through for and passes the data to the :Scan1 label code segment in the form of a call statement with parameters.

At this time, the :Scan1 label code segment can use the %1 method to get the data called over and process it~ : )

(The purpose of breaking down the continuous string into individual letters separated by spaces is to facilitate the for to get individual letters)
(And for getting strings with spaces as delimiters makes use of the default value of the for Delims parameter)

……

Brother zxcv, please talk about the ideas and principles of the other parts of the code?　



(The most difficult thing is when "away from" the various functions that can be called at any time in high-level languages, (such as special functions for string interception, statistics, etc......)
(In this case, using internal commands and simple statements in batch processing can also complete the "transmission" of ideas. )

(Almost everything is like primitive operations, a few simple statement separations, a few Goto, a few SET...... can still complete the idea like simulating the "underlying" level. )

(In such a thinking process, everything is under the condition of no ready-made function support, using these simple commands to reproduce this complex process and the realization of the dream)
(In this process, you can experience and feel the "primitive" and the most direct way to reproduce the beauty of batch processing)


(All the points were given away yesterday, and I will make up the points for zxcv this afternoon~ : )

Special characters in cmd are always a headache, and there's no way to solve them.
I also posted a thread. There's really no better way to implement it, so I use a crude method to make do.

1. @echo off
   
2. setlocal ENABLEDELAYEDEXPANSION
   
3. set str=adadfdfseffserfefsefseetsdg
   
4. set /a m=0,n=0,l=0
   
5. call :loop
   
6. for /f "tokens=1,2 delims==" %%i in ('set 字符：') do (
   
7. echo %%i=%%j
   
8. if %%j GTR !l! set l=%%j & set m=%%i
   
9. )
   
10. echo.出现次数最多的%m%=%l%
    
11. pause
    
12. goto :EOF
    
13. :loop
    
14. call set m=%%str:~%n%,1%%
    
15. if not defined m goto :EOF
    
16. set /a "字符：%m%+=1"
    
17. set /a n+=1
    
18. goto loop
    

Posted by 无奈何 on November 29, 2006 at 10:50

:Scan1
for %%i in (%exclude%) do if "%1"=="%%i" goto :eof
set exclude=%exclude% %1
call :Scan2 %1
goto :eof

Using "for %%i in (%exclude%) do if "%1"=="%%i" to filter out the same characters, if there is a duplicate, return "for %%i in (%str$%) do call :Scan1 %%i" to filter the next character. The new character not in %exclude% is added with "set exclude=%exclude% %1" (this is when I was sorting mobile phone ringtones to filter the selected numbers)

:Scan2
for %%i in (%str$%) do if "%1"=="%%i" set /a %1+=1
echo %1 !%1!
goto :eof

The filtered characters are calculated one by one for the number of occurrences. After self-calculation, "!%1!" is used with delayed variables to display the number of occurrences

The reason for using "set /a %1+=1" is to provide usage for a single character later

If you just want to display, change it to:

:Scan1
for %%i in (%exclude%) do if "%1"=="%%i" goto :eof
set exclude=%exclude% %1
set N=
call :Scan2 %1
goto :eof

:Scan2
for %%i in (%str$%) do if "%1"=="%%i" set /a N+=1
echo %1 %N%
goto :eof

You can do without delayed variables

Helplessly, the code of the moderator and brother zxcv shines with the crystallization of every line of thinking ~~~
It's really wonderful ~~

I'll help Brother redtek add points! The two of you have great comments. Unfortunately, I don't have points right now. Next time then.

Last edited by ccwan on 2006-11-30 at 12:35 AM ]

Borrowing the script from Moderator Wunaike, but it hasn't been sorted alphabetically yet ^_^:

@echo off
setlocal EnableDelayedExpansion
set str=adadfdfseffserfefsefseetsdg

:loop
set str$=%str$% %str:~0,1%
set str=%str:~1%
if not "%str%" == "" goto loop

for %%i in (%str$%) do call :Scan1 %%i
echo The most frequent occurrence: %max%=%maxN%
pause
exit

:Scan1
for %%i in (%exclude%) do if "%1"=="%%i" goto :eof
set exclude=%exclude% %1
call :Scan2 %1
goto :eof

:Scan2
for %%i in (%str$%) do if "%1"=="%%i" set /a %1+=1
if !%1! GTR !maxN! set maxN=!%1! & set max=%1
echo Character: %1=!%1!
goto :eof

If combined with sed grep, it is much simpler and appears

vkill use sed to make one~ :)

Originally posted by redtek at 2006-11-30 00:46:
vkill make one with sed~:）

Hehe~ grep -c can be used, because without using third-party tools, special characters can't be handled at all, I think

@echo off

set str=adadfdfseffserfefsefseetsdg



:loop

	set str$=%str$% %str:~0,1% && set str=%str:~1%

	if not "%str%" == "" goto loop



call :start %str$%

set . & goto :eof



:start

	if == ( goto :eof ) else ( set /a  .%1+=1 )

	shift

	goto :start

I also come to a section, borrow the code segment with the space-separated letters of zxcv brother's :loop ~:)

@echo off

set str=adadfdfseffserfefsefseetsdg



:loop

	set str$=%str$% %str:~0,1% && set str=%str:~1%

	if not "%str%" == "" goto loop



call :start %str$%

set . & goto :eof



:start

	if == ( goto :eof ) else ( set /a  .%1+=1 )

	shift

	goto :start