How to extract words containing 'ab' & 'cd' in a text file?

[Umesh]

Can anyone do it? ARMY1987- what say?

[blufox]

On May 30, 10:00 am, Umesh <fraternitydisp [e-mail] rote:

Can anyone do it? ARMY1987- what say?

Please do not post homework.
Show the code.

thanks

[Charlton Wilbur]

>>>>"U" == Umesh <fr************ ****@gmail.comw rites:

UCan anyone do it? ARMY1987- what say?

If you have to ask, it's obvious that not anyone can do it, but as I
can do it, I know someone can.

Perhaps you should attempt it and see what you come up with.

Charlton
--
Charlton Wilbur
cw*****@chromat ico.net

[Army1987]

"Umesh" <fr************ ****@gmail.comh a scritto nel messaggio
news:11******** **************@ r19g2000prf.goo glegroups.com.. .

Can anyone do it? ARMY1987- what say?

What? Why am *I* supposed to do that?

After having opened the files, etc., etc...

while (read a word)
if (the word contains "ab" && the word contains "cd")
write the word;

close the files, etc., etc...

Look up for the %s format for fscanf(), and for strstr().

[dimitris.papastamos]

This should do it...

int main(void) {
FILE *open;
char word[64]

open = fopen("file.txt ", "r");
if(!open) return -1;

while(fscanf(op en, "%s", word) != EOF) {
if((strstr(word , "ab") != NULL) || (strstr(word, "cd") !=
NULL)) {
printf("gotcha [%s] !\n", word);
}
}

fclose(open);
}

[Barry Schwarz]

On Fri, 01 Jun 2007 23:40:59 -0000, di************* ****@gmail.com
wrote:

>This should do it...

int main(void) {
FILE *open;
char word[64]

open = fopen("file.txt ", "r");
if(!open) return -1;

while(fscanf(op en, "%s", word) != EOF) {
if((strstr(word , "ab") != NULL) || (strstr(word, "cd") !=
NULL)) {

The word "about" satisfies the if and will be printed but it does not
meet the criteria specified in the subject. Only words containing ab
AND cd should be extracted.

printf("gotcha [%s] !\n", word);
}
}

fclose(open);
}

Remove del for email

[Ben Bacarisse]

di************* ****@gmail.com writes:

This should do it...

int main(void) {
FILE *open;
char word[64]

open = fopen("file.txt ", "r");
if(!open) return -1;

while(fscanf(op en, "%s", word) != EOF) {

At least write: fscanf(open, "%63s", word);
The %s format with no field width is a Really Bad Idea(TM).

if((strstr(word , "ab") != NULL) || (strstr(word, "cd") !=
NULL)) {
printf("gotcha [%s] !\n", word);
}
}

fclose(open);
}

The other errors are left as an exercise to the reader :-)

--
Ben.

[CBFalconer]

di************* ****@gmail.com wrote:

>
This should do it...

int main(void) {
FILE *open;
char word[64]

open = fopen("file.txt ", "r");
if(!open) return -1;

while(fscanf(op en, "%s", word) != EOF) {
if((strstr(word , "ab") != NULL) || (strstr(word, "cd") !=
NULL)) {
printf("gotcha [%s] !\n", word);
}
}
fclose(open);
}

I suggest you at least try code you suggest, or mark it untested.

Obvious Faults:
return -1 is illegal. Use EXIT_FAILURE and #include <stdlib>.
The test for fscanf should be "== 1".
Nothing makes cd follow ab.
Failure to return 0 (or EXIT_SUCCESS) at completion.

--
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[Ben Bacarisse]

CBFalconer <cb********@yah oo.comwrites:

di************* ****@gmail.com wrote:

>>
This should do it...

int main(void) {
FILE *open;
char word[64]

open = fopen("file.txt ", "r");
if(!open) return -1;

while(fscanf(op en, "%s", word) != EOF) {
if((strstr(word , "ab") != NULL) || (strstr(word, "cd") !=
NULL)) {
printf("gotcha [%s] !\n", word);
}
}
fclose(open);
}

I suggest you at least try code you suggest, or mark it untested.

Obvious Faults:
return -1 is illegal.

You are very harsh! Returning an int != 0, EXIT_SUCCESS or
EXIT_FAILURE is implementation defined so one might call it ill
advised, but "illegal"?

Use EXIT_FAILURE and #include <stdlib>.
The test for fscanf should be "== 1".

I agree as a general rule (well, testing for n successful matches) but
in the case of a lone "%s" is it an error? I can't see how a
conforming fscanf can return anything but EOF or 1. Even as I type
this I can see library writers checking their code for paths that
return 0 for this format.

Nothing makes cd follow ab.

The rather limited specification did not require this.

--
Ben.

[Keith Thompson]

CBFalconer <cb********@yah oo.comwrites:

di************* ****@gmail.com wrote:

>>
This should do it...

int main(void) {
FILE *open;
char word[64]

open = fopen("file.txt ", "r");
if(!open) return -1;

while(fscanf(op en, "%s", word) != EOF) {
if((strstr(word , "ab") != NULL) || (strstr(word, "cd") !=
NULL)) {
printf("gotcha [%s] !\n", word);
}
}
fclose(open);
}

I suggest you at least try code you suggest, or mark it untested.

I see no evidence that he didn't try it; the errors you point out are
ones that could easily be missed by insufficiently careful testing.

Obvious Faults:
return -1 is illegal. Use EXIT_FAILURE and #include <stdlib>.

return -1 is perfectly legal; it's merely non-portable.

The test for fscanf should be "== 1".

Yes, it should, but fscanf with a "%s" option reads the next
space-delimited word, and it will return the value EOF when it reaches
the end of the file. As far as I tell, it will never return a value
other than 1 or EOF. Just checking for EOF is poor style, but it
happens to work in this case.

Nothing makes cd follow ab.

Is that required? The only problem statement I've seen is in the
subject header: "How to extract words containing 'ab' & 'cd' in a text
file?". This could mean either
Extract words containing 'ab' and words containing 'cd'
or
Extract words containig both 'ab' and 'cd'

In either case, I see no implication of a required order (though the
problem statement is bad enough that that may well have been the
intent).

Failure to return 0 (or EXIT_SUCCESS) at completion.

Which happens to be harmless on many systems.

--
Keith Thompson (The_Other_Keit h) ks***@mib.org <http://www.ghoti.net/~kst>
San Diego Supercomputer Center <* <http://users.sdsc.edu/~kst>
"We must do something. This is something. Therefore, we must do this."
-- Antony Jay and Jonathan Lynn, "Yes Minister"