file processing in c

[wolky]

hi all my friends...
ý have a problem with file processing in c... ý have some questions
about it...
ý have two txt files... in first one there is a text, in second one
there are words that ý want to remove these words from first one...
how can ý remove those words from first one?

thx all for ur help

[Nelu]

On Mar 26, 8:33 pm, "wolky" <[e-mail]:

hi all my friends...
ý have a problem with file processing in c... ý have some questions
about it...
ý have two txt files... in first one there is a text, in second one
there are words that ý want to remove these words from first one...
how can ý remove those words from first one?

thx all for ur help

You'll have to attempt to solve the problem yourself then come back
and show us your attempt if you want to get help.

Right now I can tell you to look up:
<stdio.h>
fopen
fgets
fclose

You may also want to check out:
<string.h>
strncmp
*or*
strstr

And for something extra:
strstr
<errno.h>
errno

--
Ioan - Ciprian Tandau
tandau _at_ freeshell _dot_ org (hope it's not too late)
(... and that it still works...)

[Nelu]

On Mar 26, 8:58 pm, "Nelu" <[e-mail]:

On Mar 26, 8:33 pm, "wolky" <[e-mail]:

hi all my friends...

<snip>

And for something extra:
strstr

Ooops, I meant: strerror.

--
Ioan - Ciprian Tandau
tandau _at_ freeshell _dot_ org (hope it's not too late)
(... and that it still works...)

[osmium]

"wolky" <ho*****@gmail.comwrote:
ý have a problem with file processing in c... ý have some questions
about it...
ý have two txt files... in first one there is a text, in second one
there are words that ý want to remove these words from first one...
how can ý remove those words from first one?

Make a third file that is a copy of file 1 without the extraneous words. If
this is not a student exercise you should prepare by organizing the words so
you can find them quite rapidly. You could use a tree or bsearch() which
requires the words be sorted, see qsort(). Both of these are in <stdlib.h>.

[Martin Golding]

On Mon, 26 Mar 2007 17:33:23 -0700, wolky wrote:

hi all my friends...
ı have a problem with file processing in c... ı have some questions
about it...
ı have two txt files... in first one there is a text, in second one
there are words that ı want to remove these words from first one... how
can ı remove those words from first one?

Read the first file, producing an ordered binary tree of structs that
associate each word with its ordinal and any following punctuation.
Note that you must allow for duplicates words in the first file.

Create an ordered binary tree of the words in the second file. Whether
you allow for duplicate words in the second file is between you and
the specification.

Traverse both trees in word order, dropping all members of the first
tree that match words in the second tree.

Create an array of pointers to the remaining entries in the first tree.
Use qsort() to sort them by ordinal number.

Emit the words in the order they appear in the list, each followed by
the associated punctuation. Dealing with orphaned punctuation and
post-punctuation capitalization is left as an exercise for the reader.

thx all for ur help

Even the mesopotamians can't help you now.

Martin
--
Martin Golding | He who steals my code steals trash.
DoD #0236 | (Twas mine, tis his, and will be slave to thousands.)
A poor old decrepit Pick programmer. Sympathize at:
fo*****@comcast.net Vancouver, WA

[CBFalconer]

Martin Golding wrote:

On Mon, 26 Mar 2007 17:33:23 -0700, wolky wrote:

>ı have a problem with file processing in c... ı have some
questions about it... ı have two txt files... in first one
there is a text, in second one there are words that ı want to
remove these words from first one... how can ı remove those
words from first one?

Read the first file, producing an ordered binary tree of structs
that associate each word with its ordinal and any following
punctuation. Note that you must allow for duplicates words in the
first file.

.... snip ...

All that work is already done, using a hashtable rather than a key
(faster), and replacing ids rather than deleting them. Some simple
modifications will satisfy the OPs needs. Note that it is licensed
under the GPL. See id2id-20 in:

<http://cbfalconer.home.att.net/download/>

Arranging for a successful find of change (in filter) and emission
of otherword to replace otherword by the empty string will probably
do it. This is safe because otherword is not involved in the hash
table comparison or hashing routines. Probably take all of 5
minutes to edit, make, and test. This will, of course, foul the
reversing option.

--
Chuck F (cbfalconer at maineline dot net)
Available for consulting/temporary embedded and systems.
<http://cbfalconer.home.att.net>

--
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