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..

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dteditorchange

DtEditorChange(library call)											      DtEditorChange(library call)

NAME

       DtEditorChange -- change one or all occurrences of a string in a DtEditor widget

SYNOPSIS

       #include <Dt/Editor.h>
       Boolean DtEditorChange(
       Widget widget,
       DtEditorChangeValues *findChangeStrings,
       unsigned int instanceToChange);

DESCRIPTION

       The  DtEditorChange  function  replaces the next occurrence of a string, all occurrences of the string, or the currently selected text in a
       DtEditor widget with a replacement string.  The string to search for and the value to change it to can be the last values  entered  in  the
       Find/Change dialog (see DtEditorInvokeFindChangeDialog(3)) or passed as arguments to DtEditorChange.

       The search begins at the insertion cursor.  If the string is not found by the time the end of the document is reached, the search continues
       at the beginning of the document, stopping at the character before the insertion cursor.

       The widget argument specifies the DtEditor widget ID.

       The findChangeStrings argument specifies the string to change and the replacement value.  If findChangeStrings is NULL, DtEditorChange uses
       the  last  string  specified in the Find and Change To fields of the Find/Change dialog.  If the instanceToChange argument is DtEDITOR_CUR-
       RENT_SELECTION, the Find field of DtEditorChangeValues is ignored.

       If the instanceToChange argument is set to DtEDITOR_NEXT_OCCURRENCE, DtEditorChange replaces the next occurrence (relative to the insertion
       cursor)	of  the  find string.  If this argument is set to DtEDITOR_ALL_OCCURRENCES, all instances of the find string are changed.  If this
       argument ia set to DtEDITOR_CURRENT_SELECTION, the Find field of DtEditorChangeValues, is  ignored  and	the  currently	selected  text	is
       replaced.

       For a complete definition of the DtEditor widget and its associated resources, see DtEditor(3).

       For a complete definition of DtEditorChangeValues, see Dt/Editor.h - DtEditor(5).

RETURN VALUE

       Upon successful completion, the DtEditorChange function returns True if the substitution occurred; otherwise, it returns False.

SEE ALSO

       Dt/Editor.h - DtEditor(5), DtEditor(3), DtEditorFind(3), DtEditorInvokeFindChangeDialog(3).

														      DtEditorChange(library call)

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