Finding the Integers Question

[jobo]

Hello,

I'm very new to C so please forgive my ineptitude.

If I am given a file with "jfewuuj3uefi8j kw128jdmnsdf\s; 'd1904"

I want to capture each occurence of an integer 0-9 into an array.

So in the array I would have {3,8,1,2,8,1,9, 0,4}

How would I go about doing this? scanf? fgets?

Thank you :)

[T.M. Sommers]

jobo wrote:

Hello,

I'm very new to C so please forgive my ineptitude.

If I am given a file with "jfewuuj3uefi8j kw128jdmnsdf\s; 'd1904"

I want to capture each occurence of an integer 0-9 into an array.

So in the array I would have {3,8,1,2,8,1,9, 0,4}

How would I go about doing this? scanf? fgets?

Take a look at fgetc and isdigit.

--
Thomas M. Sommers -- tm*@nj.net -- AB2SB

[jobo]

Here's what I have in my code:
arr[i] = fgetc("%d ");

I'm gettting a "passing argument 1 of 'fgetc' from incompatible pointer
type" error.

T.M. Sommers wrote:

jobo wrote:

Hello,

I'm very new to C so please forgive my ineptitude.

If I am given a file with "jfewuuj3uefi8j kw128jdmnsdf\s; 'd1904"

I want to capture each occurence of an integer 0-9 into an array.

So in the array I would have {3,8,1,2,8,1,9, 0,4}

How would I go about doing this? scanf? fgets?

Take a look at fgetc and isdigit.

--
Thomas M. Sommers -- tm*@nj.net -- AB2SB

[T.M. Sommers]

jobo wrote:

T.M. Sommers wrote:

>>jobo wrote:

>>>I'm very new to C so please forgive my ineptitude.

If I am given a file with "jfewuuj3uefi8j kw128jdmnsdf\s; 'd1904"

I want to capture each occurence of an integer 0-9 into an array.

So in the array I would have {3,8,1,2,8,1,9, 0,4}

How would I go about doing this? scanf? fgets?

Take a look at fgetc and isdigit.

Here's what I have in my code:
arr[i] = fgetc("%d ");

I'm gettting a "passing argument 1 of 'fgetc' from incompatible pointer
type" error.

Read the man page for fgetc. It takes a FILE * as an argument,
and returns an int. You want something like this:

int ch;
while ( (ch = fgetc(file_poin ter)) != EOF ) {
if ( isdigit(ch) ) {
/* stuff ch in your array */
}
}

Assuming file_pointer is a FILE * and has been successfully
opened for reading, and the appropriate header files have been
#included.

--
Thomas M. Sommers -- tm*@nj.net -- AB2SB

[Robert Latest]

On 24 Oct 2006 22:30:04 -0700,
jobo <jo*****@gmail. comwrote
in Msg. <11************ **********@i42g 2000cwa.googleg roups.com>

If I am given a file with "jfewuuj3uefi8j kw128jdmnsdf\s; 'd1904"

I want to capture each occurence of an integer 0-9 into an array.

So in the array I would have {3,8,1,2,8,1,9, 0,4}

How would I go about doing this? scanf? fgets?

Do two passes. First go through the file counting the digits,
use the result to allocate a suitable array, and then go
through the data again to populate the array.

robert

[Richard Heathfield]

Robert Latest said:

On 24 Oct 2006 22:30:04 -0700,
jobo <jo*****@gmail. comwrote
in Msg. <11************ **********@i42g 2000cwa.googleg roups.com>

>If I am given a file with "jfewuuj3uefi8j kw128jdmnsdf\s; 'd1904"

I want to capture each occurence of an integer 0-9 into an array.

So in the array I would have {3,8,1,2,8,1,9, 0,4}

How would I go about doing this? scanf? fgets?

Do two passes. First go through the file counting the digits,
use the result to allocate a suitable array, and then go
through the data again to populate the array.

Your technique has the advantage of preserving order, but the disadvantage
of requiring the stream to be read twice. (If it's stdin, which the OP
suggests it isn't but never mind that!, then the stream might not even be
available a second time.)

If you expand the buffer as you go, using realloc when required, then you
can do this in a single pass.

(If order is not significant, an array of ten unsigned longs will be fine,
with each element being a counter for a particular digit.)

--
Richard Heathfield
"Usenet is a strange place" - dmr 29/7/1999
http://www.cpax.org.uk
email: rjh at above domain (but drop the www, obviously)

[Keith Thompson]

"jobo" <jo*****@gmail. comwrites:

Here's what I have in my code:
arr[i] = fgetc("%d ");

I'm gettting a "passing argument 1 of 'fgetc' from incompatible pointer
type" error.

Please don't top-post. Read these:

http://www.caliburn.nl/topposting.html
http://www.cpax.org.uk/prg/writings/topposting.php

Your system should have documentation for the fgetc() function. Read
it. If not, a Google search should tell you how to use it. Don't
just guess (fgetc() doesn't take printf-style or scanf-style format
strings).

--
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.

[hookah_frog]

#include<conio. h>
#include<iostre am.h>
#include<stdio. h>

void main()
{
FILE *fpt;
char c;
int temp,i[100];
int count = 0;

fpt = fopen("D:/ceg.txt","r");

if(NULL == fpt)
{
printf("\n Cannot open file");
}
else
{
do
{
c = getc(fpt);

if( (c >='0' ) && (c <='9' ))
{
i[count ++] = c-'0';
}

}
while(c!=EOF);
fclose(fpt);
}
for(temp = 0;temp<count;te mp++)
printf("%d",i[temp]);
}
// USING mem. allocation would be more suitable

[Robert Latest]

On Wed, 25 Oct 2006 07:55:50 +0000,
Richard Heathfield <in*****@invali d.invalidwrote
in Msg. <tc************ *************** ***@bt.com>

>>>
So in the array I would have {3,8,1,2,8,1,9, 0,4}

>Do two passes. First go through the file counting the digits,
use the result to allocate a suitable array, and then go
through the data again to populate the array.

Your technique has the advantage of preserving order, but the disadvantage
of requiring the stream to be read twice. (If it's stdin, which the OP
suggests it isn't but never mind that!, then the stream might not even be
available a second time.)

If you expand the buffer as you go, using realloc when required, then you
can do this in a single pass.

Of course. I tried to keep my answer on the level of suspected cluefulness
on the OP's part

(If order is not significant, an array of ten unsigned longs will be fine,
with each element being a counter for a particular digit.)

The OP's example array content shows that this is not what he wants.

robert

[Richard Heathfield]

Robert Latest said:

<snip>

I tried to keep my answer on the level of suspected cluefulness
on the OP's part

I see. I just hope you didn't overshoot! :-)

>(If order is not significant, an array of ten unsigned longs will be
fine, with each element being a counter for a particular digit.)

The OP's example array content shows that this is not what he wants.

Oops, so it does.

--
Richard Heathfield
"Usenet is a strange place" - dmr 29/7/1999
http://www.cpax.org.uk
email: rjh at above domain (but drop the www, obviously)