China DOS Union

The effect of the delay variable you want:

The second method:

@echo %dbg% off

setlocal enabledelayedexpansion



set b=0

for /l %%i in (0,1,4) do (

	echo !b!

	call set /a b+=1

)

The output is as follows:

C:\TEMP\k>b.bat

0

1

2

3

4

Brother upstairs, you are completely taking a shortcut.

In this way, I require:

@echo %dbg% off

for /L %%i in (0,1,4) do (
echo %%i
)
echo %%i cannot be displayed using %%i. Another variable needs to be used for display, and there should be no relation at all between this variable and %%i

Brother onlykier, I have read your code example on floor 8 and have run and debugged it many times...

However, the problem you were trying to address above didn't follow your line of thinking :)

You thought about how to solve a problem, but almost all the places where errors occurred were affected by some basic knowledge points :)
And Brother onlykier is learning very fast, but in the end, he still has to return to those basic variable assignments, SET, delay variables, For structures, operation and escape of special symbols...

So, it is suggested that onlykier retype all the knowledge points mentioned in the following link line by line from start to finish ~:)
Then come back and look again, I believe Brother onlykier will surpass the present...
And this whole process may only take a few days or even one or two days.
But doing this whole thing from start to finish in these one or two days, I believe onlykier will never have problems again,
but will start to enter the state of knowing how to handle some unknown problems and can find solutions very quickly :)


About SET variables, delay variables, usage of various symbols...
http://www.cn-dos.net/forum/viewthread.php?tid=24549&fpage=1

[ Last edited by redtek on 2006-11-7 at 03:57 AM ]

Brother upstairs, just kill me
I'll give another example
I just want to display the first line, but the following code displays all, why?
@echo off
dir d: /b>>d:\1.txt
set c=0
echo 1,%c%
for /f %%i in (d:\1.txt) do (
if %c% equ 0 (set c=1
echo 2,%c%
echo %%i)
)

[ Last edited by onlykier on 2006-11-6 at 03:12 PM ]

Brother upstairs, I won't kill you, or you let me commit suicide~:)

In your for %%i in (d:\1.txt) do (without adding the /f parameter here, can you read the file content?)

I have made modifications. Brother upstairs, what's your QQ number? I'm so anxious waiting for the answer.

set c=1
echo 2,%c%
Why is the output %c% still 0?

Forum pagination, didn't see redtek's second method ^^!
set b=0
for /l %%i in (0,1,4) do (
echo !b!
call set /a b+=1
And then ask, why is there a call here?

@echo %dbg% off

:: Delay variable

setlocal enabledelayedexpansion



dir d: /b>>d:\1.txt

set c=0

echo 1,%c%



:: /f parameter

:: "delims=" can read strings with spaces...

for /f "delims=" %%i in (d:\1.txt) do (



	if !c! equ 0 (

		set c=1 

		echo 2,!c!

		echo %%i

	)

)



It is suggested to write code with indentation like this:)

[ Last edited by redtek on 2006-11-7 at 04:36 AM ]

```
@echo off
dir c:\ /b>>c:\1.txt
set /p s=<c:\1.txt
echo %s%
pause
```

Originally posted by onlykier at 2006-11-7 04:28:
Forum page turning, didn't see redtek's second method ^^!
set b=0
for /l %%i in (0,1,4) do (
echo !b!
call set /a b+=1
Please ask again, why is there a call here?

That call should be deleted, that was left over from another experiment when copying and forgetting to delete it~ : )

Brother lxmxn's code is very concise, appreciate it~:)

@echo off
dir c:\ /b>>c:\1.txt
set /p s=<c:\1.txt
echo %s%
pause
Why does this code only display the first line? I thought it should display many lines because the content of c:\1.txt is assigned to s.