Questions

[Tinker]

Does anyone know how to read a txt file which is created before and
inside the files only hv numbers and did not structured.
how can i only read the secound integer such as the patten inside the
txt file is 11 12 13 and i only want the programme to display the 12
on the screen?
Thanks a lot!Please help!

[Jens.Toerring@physik.fu-berlin.de]

Re: Questions

Tinker <lty_hk@hotmail .com> wrote:[color=blue]
> Does anyone know how to read a txt file which is created before and
> inside the files only hv numbers and did not structured.
> how can i only read the secound integer such as the patten inside the
> txt file is 11 12 13 and i only want the programme to display the 12
> on the screen?[/color]

FILE *fp;
int number;
int count = 0;

if ( ( fp = fopen( "file.dat", "r" ) ) == NULL )
exit( EXIT_FAILURE );

while ( fscanf( "%d", &number ) == 1 && ++count < 2 )
/* empty */ ;

if ( count != 2 )
exit( EXIT_FAILURE );

printf( "The number is %d\n", number );

Take care, this will also pick up numbers embedded in text like
"abc234xyz" .
Regards, Jens
--
\ Jens Thoms Toerring ___ Jens.Toerring@p hysik.fu-berlin.de
\______________ ____________ http://www.toerring.de

[j]

Re: Questions


<Jens.Toerring@ physik.fu-berlin.de> wrote in message
news:2s8it6F1if gctU1@uni-berlin.de...[color=blue]
> Tinker <lty_hk@hotmail .com> wrote:[color=green]
> > Does anyone know how to read a txt file which is created before and
> > inside the files only hv numbers and did not structured.
> > how can i only read the secound integer such as the patten inside the
> > txt file is 11 12 13 and i only want the programme to display the 12
> > on the screen?[/color]
>
> FILE *fp;
> int number;
> int count = 0;
>
> if ( ( fp = fopen( "file.dat", "r" ) ) == NULL )
> exit( EXIT_FAILURE );
>
> while ( fscanf( "%d", &number ) == 1 && ++count < 2 )
> /* empty */ ;[/color]

Or simply eliminate the use of ``count''
and use ``*'' along with a conversion
specifier that is followed by the apprioriate
conversion specifier for the value that he wants.



--
j

[CBFalconer]

Re: Questions

Tinker wrote:[color=blue]
>
> Does anyone know how to read a txt file which is created before
> and inside the files only hv numbers and did not structured. how
> can i only read the secound integer such as the patten inside the
> txt file is 11 12 13 and i only want the programme to display the
> 12 on the screen?[/color]

What are hv numbers? High voltage?

--
Chuck F (cbfalconer@yah oo.com) (cbfalconer@wor ldnet.att.net)
Available for consulting/temporary embedded and systems.
<http://cbfalconer.home .att.net> USE worldnet address!

[Arthur J. O'Dwyer]

Re: Questions


On Sun, 3 Oct 2004, CBFalconer wrote:[color=blue]
>
> Tinker wrote:[color=green]
>>
>> Does anyone know how to read a txt file which is created before
>> and inside the files only hv numbers and did not structured. how
>> can i only read the secound integer such as the patten inside the
>> txt file is 11 12 13 and i only want the programme to display the
>> 12 on the screen?[/color]
>
> What are hv numbers? High voltage?[/color]

No, no, the word "hv" is clearly being used as a verb in that sentence!
I respectfully submit that it is intended as an abbreviation of "hover"
--- i.e., the numbers are actually hovering inside the files. (The OP
is obviously going to be interested in the 'float' datatype.)

-Arthur

[j]

Re: Questions


"j" <jake30NOSPAM@b ellsouth.net> wrote in message
news:N0F7d.1295 62$Np2.43016@bi gnews4.bellsout h.net...

< snip>
[color=blue]
> specifier that is followed by the apprioriate
> conversion specifier for the value that he wants.
>[/color]

I meant appropriate. I certainly butchered that word.



--
j

[Tinker]

Re: Questions

"j" <jake30NOSPAM@b ellsouth.net> wrote in message news:<N0F7d.129 562$Np2.43016@b ignews4.bellsou th.net>...[color=blue]
> <Jens.Toerring@ physik.fu-berlin.de> wrote in message
> news:2s8it6F1if gctU1@uni-berlin.de...[color=green]
> > Tinker <lty_hk@hotmail .com> wrote:[color=darkred]
> > > Does anyone know how to read a txt file which is created before and
> > > inside the files only hv numbers and did not structured.
> > > how can i only read the secound integer such as the patten inside the
> > > txt file is 11 12 13 and i only want the programme to display the 12
> > > on the screen?[/color]
> >
> > FILE *fp;
> > int number;
> > int count = 0;
> >
> > if ( ( fp = fopen( "file.dat", "r" ) ) == NULL )
> > exit( EXIT_FAILURE );
> >
> > while ( fscanf( "%d", &number ) == 1 && ++count < 2 )
> > /* empty */ ;[/color]
>
> Or simply eliminate the use of ``count''
> and use ``*'' along with a conversion
> specifier that is followed by the apprioriate
> conversion specifier for the value that he wants.[/color]


Thanks
But how about if i want to read the secound number of each line?
Please help

[j]

Re: Questions


"Tinker" <lty_hk@hotmail .com> wrote in message
news:673df668.0 410030919.4ae86 e29@posting.goo gle.com...[color=blue]
> "j" <jake30NOSPAM@b ellsouth.net> wrote in message[/color]
news:<N0F7d.129 562$Np2.43016@b ignews4.bellsou th.net>...[color=blue][color=green]
> > <Jens.Toerring@ physik.fu-berlin.de> wrote in message
> > news:2s8it6F1if gctU1@uni-berlin.de...[color=darkred]
> > > Tinker <lty_hk@hotmail .com> wrote:
> > > > Does anyone know how to read a txt file which is created before and
> > > > inside the files only hv numbers and did not structured.
> > > > how can i only read the secound integer such as the patten inside[/color][/color][/color]
the[color=blue][color=green][color=darkred]
> > > > txt file is 11 12 13 and i only want the programme to display the 12
> > > > on the screen?
> > >
> > > FILE *fp;
> > > int number;
> > > int count = 0;
> > >
> > > if ( ( fp = fopen( "file.dat", "r" ) ) == NULL )
> > > exit( EXIT_FAILURE );
> > >
> > > while ( fscanf( "%d", &number ) == 1 && ++count < 2 )
> > > /* empty */ ;[/color]
> >
> > Or simply eliminate the use of ``count''
> > and use ``*'' along with a conversion
> > specifier that is followed by the apprioriate
> > conversion specifier for the value that he wants.[/color]
>
>
> Thanks
> But how about if i want to read the secound number of each line?
> Please help[/color]

Then you would want to exclude everything that follows
the second number up to a new line.

so you can use,

#include <stdio.h>

int main(void)
{
int num;

while((fscanf(s tdin, "%*s %d %*[^\n]", &num)) == 1)
printf("Number: %d\n", num);

return 0;
}

or with a different variation of the format string:
fscanf(stdin, "%*d %d %*[^\n]", &num);
fscanf(stdin, "%*[^ ] %d %*[^\n]", &num);

You need to take into account your programs behaviour
if your file will have spurious data. e.g., ``aaaaa 12 1000''
or whitespace that proceeds the second number.
Then construct the appropriate format string
to attain the desired behaviour that you want for
your program.