fopen

**Walter Roberson** · Jun 27 '08, 07:41 PM

Re: fopen

In article <%GE5k.40579$lE 3.1104@trnddc05 >,
Bill Cunningham <nospam@nspam.c omwrote:

fp = fopen ("data", "wa");

I said to use "a", not "wa".
--
"MAMA: Oh--So now it's life. Money is life. Once upon a time freedom
used to be life--now it's money. I guess the world really do change.
WALTER: No--it was always money, Mama. We just didn't know about it."
-- Lorraine Hansberry

**Bill Cunningham** · Jun 27 '08, 07:41 PM

Re: fopen

"Richard Heathfield" <rjh@see.sig.in validwrote in message
news:g8KdnYe2zO ZlvMrVnZ2dneKdn ZydnZ2d@bt.com. ..

Bill Cunningham said:
>

>>
>"Bill Cunningham" <nospam@nspam.c omwrote in message
>news:66D5k.209 48$3j2.17956@tr nddc03...

>>>
>>"Serve Lau" <nihao@qinqin.c omwrote in message
>>news:e8de8$48 56df32$541fc2ec $30325@cache5.t ilbu1.nb.home.n l...

>>
> You know my book doesn't give return values for these functions for
>error checking.

>
In message <3d38f60e_3@cor p.newsgroups.co m(posted on 20 July 2002) you
wrote:
>
"This little K&R2 book is giving me the devil of a time."
>
It is not unreasonable to deduce from that statement that you have had a
copy of K&R2 since at least 2002.
>
Despite your claim, K&R2 *does* document the return value semantics for
fopen, freopen, fflush, fclose, fprintf, fscanf, fgetc, fgets, fputc,
fputs, fread, fwrite, fseek, ftell, fgetpos, and fsetpos - on pp242-248.
>

>What about ftell and fseek do they return -1 or non zero
>when successful ?

>
Read the book.
>

I may have to break it out. I have a little pocket reference I've leafed
though. Couldn't find return values. Well I'll get them.

Bill

**rahul** · Jun 27 '08, 07:41 PM

Re: fopen

On Jun 17, 8:35 am, "Bill Cunningham" <nos...@nspam.c omwrote:

"Richard Heathfield" <r...@see.sig.i nvalidwrote in message
>
news:g8KdnYe2zO ZlvMrVnZ2dneKdn ZydnZ2d@bt.com. ..
>

Bill Cunningham said:

>

"Bill Cunningham" <nos...@nspam.c omwrote in message
>news:66D5k.209 48$3j2.17956@tr nddc03...

>

>"Serve Lau" <ni...@qinqin.c omwrote in message
>>news:e8de8$48 56df32$541fc2ec $30325@cache5.t ilbu1.nb.home.n l...

>

You know my book doesn't give return values for these functions for
error checking.

>

In message <3d38f60...@cor p.newsgroups.co m(posted on 20 July 2002) you
wrote:

>

"This little K&R2 book is giving me the devil of a time."

>

It is not unreasonable to deduce from that statement that you have had a
copy of K&R2 since at least 2002.

>

Despite your claim, K&R2 *does* document the return value semantics for
fopen, freopen, fflush, fclose, fprintf, fscanf, fgetc, fgets, fputc,
fputs, fread, fwrite, fseek, ftell, fgetpos, and fsetpos - on pp242-248.

>

What about ftell and fseek do they return -1 or non zero
when successful ?

>

Read the book.

>
I may have to break it out. I have a little pocket reference I've leafed
though. Couldn't find return values. Well I'll get them.
>
Bill

/* Code not compiled */
#include <stdio.h>
#include <stdlib.h>

int
main(int argc, char *argv[]) {
double x;
FILE *fp;
x = strtod(argv[1], NULL);
fp = fopen("foo", "a+");
fprintf(fp, "%.2f", x);
fclose(fp);
return 0;
}

Probably this is what you want to do. The mode "a+" means open for
appending and reading as well. Its not required if you just wish to
append to the file.
Return type for ftell is long. fseek returns int ( -1 on error, 0
otherwise ). If you are on linux/unix box, use the man pages. If you
are on a windows machine and using Visual Studio, you can use MSDN.
Its better to have the documentation handy.

**Chris Thomasson** · Jun 27 '08, 07:41 PM

Re: fopen

"Bill Cunningham" <nospam@nspam.c omwrote in message
news:5iG5k.6640 4$bs3.8292@trnd dc07...

>
"Richard Heathfield" <rjh@see.sig.in validwrote in message
news:g8KdnYe2zO ZlvMrVnZ2dneKdn ZydnZ2d@bt.com. ..

>Bill Cunningham said:
>>

>>>
>>"Bill Cunningham" <nospam@nspam.c omwrote in message
>>news:66D5k.20 948$3j2.17956@t rnddc03...
>>>>
>>>"Serve Lau" <nihao@qinqin.c omwrote in message
>>>news:e8de8$4 856df32$541fc2e c$30325@cache5. tilbu1.nb.home. nl...
>>>
>> You know my book doesn't give return values for these functions for
>>error checking.

>>
>In message <3d38f60e_3@cor p.newsgroups.co m(posted on 20 July 2002) you
>wrote:
>>
> "This little K&R2 book is giving me the devil of a time."
>>
>It is not unreasonable to deduce from that statement that you have had a
>copy of K&R2 since at least 2002.
>>
>Despite your claim, K&R2 *does* document the return value semantics for
>fopen, freopen, fflush, fclose, fprintf, fscanf, fgetc, fgets, fputc,
>fputs, fread, fwrite, fseek, ftell, fgetpos, and fsetpos - on pp242-248.
>>

>>What about ftell and fseek do they return -1 or non zero
>>when successful ?

>>
>Read the book.
>>

I may have to break it out. I have a little pocket reference I've
leafed though. Couldn't find return values. Well I'll get them.

fopen

http://www.opengroup.org/onlinepubs/007908775/xsh/fopen.html

fclose

http://www.opengroup.org/onlinepubs/007908775/xsh/fclose.html

fread

http://www.opengroup.org/onlinepubs/007908775/xsh/fread.html

fwrite

http://www.opengroup.org/onlinepubs/007908775/xsh/fwrite.html

fflush

http://www.opengroup.org/onlinepubs/007908775/xsh/fflush.html

www.opengroup.org

http://www.opengroup.org/pubs/online/7908799/xsh/fgetpos.html

www.opengroup.org

http://www.opengroup.org/pubs/online/7908799/xsh/fsetpos.html

fscanf

http://www.opengroup.org/onlinepubs/007908775/xsh/fscanf.html

fputs

http://www.opengroup.org/onlinepubs/009695399/functions/fputs.html

fputc

http://www.opengroup.org/onlinepubs/009695399/functions/fputc.html

fgets

http://www.opengroup.org/onlinepubs/009695399/functions/fgets.html

fgetc

http://www.opengroup.org/onlinepubs/009695399/functions/fgetc.html

ferror

http://www.opengroup.org/onlinepubs/009695399/functions/ferror.html

feof

http://www.opengroup.org/onlinepubs/009695399/functions/feof.html

ftell

http://www.opengroup.org/onlinepubs/009695399/functions/ftell.html

fseek

http://www.opengroup.org/onlinepubs/000095399/functions/fseek.html

fgetwc

http://www.opengroup.org/onlinepubs/009695399/functions/fgetwc.html

fgetws

http://www.opengroup.org/onlinepubs/009695399/functions/fgetws.html

freopen

http://www.opengroup.org/onlinepubs/009695399/functions/freopen.html

ect...

www.opengroup.org

http://www.opengroup.org/

is you friend!

**CBFalconer** · Jun 27 '08, 07:41 PM

Re: fopen

Bill Cunningham wrote:

"Richard Heathfield" <rjh@see.sig.in validwrote:
>

><3d38f60e_3@co rp.newsgroups.c om(posted on 20 July 2002) you
>wrote:
>>
> "This little K&R2 book is giving me the devil of a time."
>>
>It is not unreasonable to deduce from that statement that you
>have had a copy of K&R2 since at least 2002.
>>
>Despite your claim, K&R2 *does* document the return value
>semantics for fopen, freopen, fflush, fclose, fprintf, fscanf,
>fgetc, fgets, fputc, fputs, fread, fwrite, fseek, ftell,
>fgetpos, and fsetpos - on pp242-248.
>>

>>What about ftell and fseek do they return -1 or non zero
>>when successful ?

>>
>Read the book.

>
I may have to break it out. I have a little pocket reference
I've leafed though. Couldn't find return values.

You should never have hidden it. It answers virtually every
question you have asked here.

--
[mail]: Chuck F (cbfalconer at maineline dot net)
[page]: <http://cbfalconer.home .att.net>
Try the download section.

** Posted from http://www.teranews.com **

**CBFalconer** · Jun 27 '08, 07:41 PM

Re: fopen

Serve Lau wrote:

"Bill Cunningham" <nospam@nspam.c omschreef in bericht
>

>I have a question about fopen. I want to append text to a text
>file already written. I think this is what I need to do. If I am
>correct fopen's second parameter takes only 2 letters. I am using
>wt. To append text would I need another call to fopen if my text
>file isn't already existing consisting of wa or a+ ?

>
read your favorite C book and try it out, its in there no matter
if its a good or bad book

You appear to devote your time to telling people not to ask
questions, using incorrect punctuation.

--
[mail]: Chuck F (cbfalconer at maineline dot net)
[page]: <http://cbfalconer.home .att.net>
Try the download section.

** Posted from http://www.teranews.com **

**Serve Lau** · Jun 27 '08, 07:42 PM

Re: fopen

"CBFalconer " <cbfalconer@yah oo.comschreef in bericht
news:4856EAF9.A 326DC80@yahoo.c om...

Serve Lau wrote:

>"Bill Cunningham" <nospam@nspam.c omschreef in bericht
>>

>>I have a question about fopen. I want to append text to a text
>>file already written. I think this is what I need to do. If I am
>>correct fopen's second parameter takes only 2 letters. I am using
>>wt. To append text would I need another call to fopen if my text
>>file isn't already existing consisting of wa or a+ ?

>>
>read your favorite C book and try it out, its in there no matter
>if its a good or bad book

>
You appear to devote your time to telling people not to ask
questions, using incorrect punctuation.

Please show me my posts that justifies this general statement. Also please
dont criticize my puntuation, it makes me feel VERY bad.

**CBFalconer** · Jun 27 '08, 07:42 PM

Re: fopen

Serve Lau wrote:

"CBFalconer " <cbfalconer@yah oo.comschreef:

>Serve Lau wrote:

>>"Bill Cunningham" <nospam@nspam.c omschreef in bericht
>>>
>>>I have a question about fopen. I want to append text to a text
>>>file already written. I think this is what I need to do. If I am
>>>correct fopen's second parameter takes only 2 letters. I am using
>>>wt. To append text would I need another call to fopen if my text
>>>file isn't already existing consisting of wa or a+ ?
>>>
>>read your favorite C book and try it out, its in there no matter
>>if its a good or bad book ^^

> ^^
>You appear to devote your time to telling people not to ask
>questions, using incorrect punctuation.

>
Please show me my posts that justifies this general statement. Also
please dont criticize my puntuation, it makes me feel VERY bad.

^^
Alright, I'll ignore punctuation. :-) As for general statements,
the quotation above will do.

--
[mail]: Chuck F (cbfalconer at maineline dot net)
[page]: <http://cbfalconer.home .att.net>
Try the download section.

** Posted from http://www.teranews.com **

**Serve Lau** · Jun 27 '08, 07:42 PM

Re: fopen

"CBFalconer " <cbfalconer@yah oo.comschreef in bericht
news:485AD88B.C F3F7D84@yahoo.c om...

>Please show me my posts that justifies this general statement. Also
>please dont criticize my puntuation, it makes me feel VERY bad.

^^
Alright, I'll ignore punctuation. :-) As for general statements,
the quotation above will do.

get out more

**Richard Bos** · Jun 27 '08, 07:42 PM

Re: fopen

"Serve Lau" <nihao@qinqin.c omwrote:

"CBFalconer " <cbfalconer@yah oo.comschreef in bericht
news:485AD88B.C F3F7D84@yahoo.c om...

Please show me my posts that justifies this general statement. Also
please dont criticize my puntuation, it makes me feel VERY bad.

^^
Alright, I'll ignore punctuation. :-) As for general statements,
the quotation above will do.

>
get out more

Leer je talen correct schrijven, dwaze Belg. Je bent een belediging voor
het Nederlandse taalgebied.

Richard

fopen

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