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Full Discussion: Find and print number after string in C
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
Old 05-26-2011
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..
 

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LEARN ABOUT DEBIAN

file::find::object::rule::procedural

File::Find::Object::Rule::Procedural(3pm)		User Contributed Perl Documentation		 File::Find::Object::Rule::Procedural(3pm)

NAME

       File::Find::Object::Rule::Procedural - File::Find::Object::Rule's procedural interface

SYNOPSIS

	 use File::Find::Object::Rule;

	 # find all .pm files, procedurally
	 my @files = find(file => name => '*.pm', in => @INC);

DESCRIPTION

       In addition to the regular object-oriented interface, File::Find::Object::Rule provides two subroutines for you to use.

       "find( @clauses )"
       "rule( @clauses )"
	   "find" and "rule" can be used to invoke any methods available to the OO version.  "rule" is a synonym for "find"

       Passing more than one value to a clause is done with an anonymous array:

	my $finder = find( name => [ '*.mp3', '*.ogg' ] );

       "find" and "rule" both return a File::Find::Object::Rule instance, unless one of the arguments is "in", in which case it returns a list of
       things that match the rule.

	my @files = find( name => [ '*.mp3', '*.ogg' ], in => $ENV{HOME} );

       Please note that "in" will be the last clause evaluated, and so this code will search for mp3s regardless of size.

	my @files = find( name => '*.mp3', in => $ENV{HOME}, size => '<2k' );
							   ^
							   |
		      Clause processing stopped here ------/

       It is also possible to invert a single rule by prefixing it with "!"  like so:

	# large files that aren't videos
	my @files = find( file	  =>
			  '!name' => [ '*.avi', '*.mov' ],
			  size	  => '>20M',
			  in	  => $ENV{HOME} );

AUTHOR

       Richard Clamp <richardc@unixbeard.net>

COPYRIGHT

       Copyright (C) 2003 Richard Clamp.  All Rights Reserved.

       This module is free software; you can redistribute it and/or modify it under the same terms as Perl itself.

SEE ALSO

       File::Find::Object::Rule

perl v5.14.2							    2012-05-05				 File::Find::Object::Rule::Procedural(3pm)
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