China DOS Union

The processing has reached such a level, really an outstanding person! Take it down and savor it slowly

The effect of removing call is the same.

The role of call is sometimes very big.

@echo off
set a=1
echo %a%
call :aa a
echo %a%
goto :EOF

:aa
call set %1=2
goto :EOF

The first sentence call is the job content

The second sentence call is an unnecessary addition

set %1=2

And

call set %1=2

The results are not different

In the following example call is useful

@echo off

set a=1 2 3

echo %a%

call :aa a

echo %a%

goto :EOF



:aa

call set %1=%%%1%% 4 5 6

goto :EOF

[ Last edited by qzwqzw on 2007-1-29 at 02:03 AM ]

Please clarify your request. Are you asking for a translation of this Chinese text into English as per the given requirements? If so, here is the translation:

请问 qzwqzw :

1.---------------------------
call set %1=%%%1%% 4 5 6

Before the code is tested and run, how to determine how many % symbols to use.

2.---------------------------
call set %1=%%%1%% 4 5 6 is equivalent to set %1=%a% 4 5 6

Is there a necessity for call set.

[ Last edited by qjbm on 2007-1-29 at 02:23 AM ]

Wow~~~~~Pretty impressive, though I didn't understand it.... Sweat~~

Add another pair of %%

call set %1=%%%1%% 4 5 6
↓
call set a=%%a%% 4 5 6
　　↓
set a=%a% 4 5 6

@echo off
set a=1 2 3
echo %a%
call :aa a
echo %a%
goto :EOF

:aa
call set %1=%%%1%% 4 5 6
goto :EOF

The understanding is good. To a certain extent, the role of call is to substitute variable delay

@echo off

setlocal enabledelayedexpansion

set a=1 2 3

echo %a%

call :aa a

echo %a%

pause

goto :EOF



:aa

set %1=!%1! 4 5 6

goto :EOF

---qjbm-----------

Q1: The general principle is that you use as many % as the number of times you need to parse.

For example, call set %1=%%%1%% 4 5 6

Before the call is executed, the command line has been processed into a form like this:

call set a=%a% 4 5 6

After the call is executed and before the set is executed, the command line becomes like this:

set a=1 2 3 4 5 6

Q2: When the variable name used in the aa segment is uncertain or dynamically changing, call set is useful.

---PPdos----------------------------------

Understood well.

But it is more appropriate to understand it the other way around -

The role of variable delay l is to a certain extent to replace call.

Because the usage of call appeared much earlier.

Before there was cmd.

In DOS, call was used to implement the pass-by-reference feature similar to C language.

Great, collect it and study it slowly~~~~~~

The creativity is quite good. Just there are too many unnecessary sentences. Simplify it.

@echo off & setlocal EnableDelayedExpansion

mode con cols=100 lines=40

title COLOR TIME

call :tnb

set spc=                                                                          

set font=█★●◆□◎◇¤⊙〓



:new

setlocal

color e%RANDOM:~-1%

set rdfont=!font:~%RANDOM:~-1%,1!

set/a a=%random%%%50,b=%random%%%35

set nk=!spc:~0,%a%!

for /l %%a in (0,1,%b%) do echo.

if "%time:~0,1%"==" " set time=0%time:~1%



echo %nk%                  %date%

echo %nk% !%time:~0,1%a:█=%rdfont%! !%time:~1,1%a:█=%rdfont%!     !%time:~3,1%a:█=%rdfont%! !%time:~4,1%a:█=%rdfont%!

echo %nk% !%time:~0,1%b:█=%rdfont%! !%time:~1,1%b:█=%rdfont%!     !%time:~3,1%b:█=%rdfont%! !%time:~4,1%b:█=%rdfont%!

echo %nk% !%time:~0,1%c:█=%rdfont%! !%time:~1,1%c:█=%rdfont%!  · !%time:~3,1%c:█=%rdfont%! !%time:~4,1%c:█=%rdfont%!

echo %nk% !%time:~0,1%d:█=%rdfont%! !%time:~1,1%d:█=%rdfont%!     !%time:~3,1%d:█=%rdfont%! !%time:~4,1%d:█=%rdfont%!

echo %nk% !%time:~0,1%e:█=%rdfont%! !%time:~1,1%e:█=%rdfont%!  · !%time:~3,1%e:█=%rdfont%! !%time:~4,1%e:█=%rdfont%!

echo %nk%             www.cn-dos.net DOSCC WINBY.

ping 127.1 -n 3 >NUL

cls

endlocal

goto :new



:tnb

rem 0-9 digital appearance.

set 0a=█████

set 0b=█      █

set 0c=█      █

set 0d=█      █

set 0e=█████



set 1a=  ██   

set 1b=    █   

set 1c=    █   

set 1d=    █   

set 1e=    █   



set 2a=    ███

set 2b=        █

set 2c=█████

set 2d=█        

set 2e=█████



set 3a=    ███

set 3b=        █

set 3c=█████

set 3d=        █

set 3e=█████



set 4a=█        

set 4b=█      █

set 4c=█████

set 4d=        █

set 4e=        █



set 5a=███   

set 5b=█        

set 5c=█████

set 5d=        █

set 5e=█████



set 6a=███   

set 6b=█        

set 6c=█████

set 6d=█      █

set 6e=█████



set 7a=█████

set 7b=█      █

set 7c=        █

set 7d=        █

set 7e=        █



set 8a=█████

set 8b=█      █

set 8c=█████

set 8d=█      █

set 8e=█████



set 9a=█████

set 9b=█      █

set 9c=█████

set 9d=        █

set 9e=  ████

I'm really佩服 you guys.

Haha...

Haven't been here to post for a long time.

Saw a lot of good things today.

Studying intensively right now.

*_*

The handwriting of the numbers is not very nice.

Top.............
But I always feel something is missing