Find and print number after string in C Post: 302525445

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Top Forums Programming Find and print number after string in C Post 302525445 by cgol on Thursday 26th of May 2011 05:05:06 PM

05-26-2011

Registered User

Find and print number after string in C

I'm trying find and print a number after a specific user passed string in each line of a text file using C (as requested by the powers that be). I've pieced together enough to read the file, find the string and print the line it was found on but I’m not sure where to even start in terms of finding the number after the string. Any tips would be much appreciated.

The below code outputs the line number where the string is found:

Code:

/* usage exename textfile searchstring */
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
int main(int argc, char *argv[]) 
{ 
FILE *file; 
char line[BUFSIZ]; 
int linen = 1; 
file = fopen(argv[1], "r"); 
if(file != NULL) { 
  while(fgets(line, sizeof(line), file)){ 
     if(strstr(line, argv[2]) != NULL) { 
        printf("Found %s %s %i\n",argv[2],"@ line",linen); 
     }
 ++linen;     
 } 
} 
else { 
  perror(argv[1]); 
  perror(argv[2]); 
} 
fclose(file); 
return 0; 
}

My text file looks like below. I'm trying to print the number as is the file (2 decimals) after "val=".

Code:

123 test=123 val=233.33 x=111 y=222
123 test=123 val=.33 x=111 
123 xr=3 test=123 x=111 y=222
123 test=123 val=233. x=111 y=222
123 test=123 val=233.33 x=111 y=222
 
Output from current code:
Found val @ line 1
Found val @ line 2
Found val @ line 4
Found val @ line 5

Last edited by pludi; 05-27-2011 at 06:53 AM..

cgol

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LEARN ABOUT DEBIAN

file::find::wanted

Wanted(3pm)						User Contributed Perl Documentation					       Wanted(3pm)

NAME

       File::Find::Wanted - More obvious wrapper around File::Find

VERSION

       Version 1.00

SYNOPSIS

       File::Find is a great module, except that it doesn't actually find anything.  Its "find()" function walks a directory tree and calls a
       callback function.  Unfortunately, the callback function is deceptively called "wanted", which implies that it should return a boolean
       saying whether you want the file.  That's not how it works.

       Most of the time you call "find()", you just want to build a list of files.  There are other modules that do this for you, most notably
       Richard Clamp's great File::Find::Rule, but in many cases, it's overkill, and you need to learn a new syntax.

       With the "find_wanted" function, you supply a callback sub and a list of starting directories, but the sub actually should return a boolean
       saying whether you want the file in your list or not.

       To get a list of all files ending in .jpg:

	   my @files = find_wanted( sub { -f && /.jpg$/ }, $dir );

       For a list of all directories that are not CVS or .svn:

	   my @files = find_wanted( sub { -d && !/^(CVS|.svn)$/ }, $dir ) );

       It's easy, direct, and simple.

WHY DO THIS
?
       The cynical may say "that's just the same as doing this":

	   my @files;
	   find( sub { push @files, $File::Find::name if -f && /.jpg$/ }, $dir );

       Sure it is, but File::Find::Wanted makes it more obvious, and saves a line of code.  That's worth it to me.  I'd like it if find_wanted()
       made its way into the File::Find distro, but for now, this will do.

FUNCTIONS

   find_wanted( &wanted, @directories )
       Descends through @directories, calling the wanted function as it finds each file.  The function returns a list of all the files and
       directories for which the wanted function returned a true value.

       This is just a wrapper around "File::Find::find()".  See File::Find for details on how to modify its behavior.

COPYRIGHT &; LICENSE
       Copyright 2005-2012 Andy Lester.

       This program is free software; you can redistribute it and/or modify it under the terms of the Artistic License v2.0.

perl v5.14.2							    2012-06-08							       Wanted(3pm)

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