Can't believe my "global" variable question gets so many responses!

I have another problem.  I have simple function below which check to see if
the argument enter at the command line is a valid number.  This function
work fine with possitive integer, but I want it to accept floating point
number as well.  The floating point number can include "+" and "-" sign, and
decimal point.

Thank you in advance!
Thomas

/********************************************************************
* check_valid_number:   this function checks each character in      *
*                       string to ensure that it is a valid         *
*                       digit.  It return 1 if string makes a       *
*                       valid number, zero otherwise.               *
*                                                                   *
* char_string       :   a string to be tested if it is a valid      *
*                       digit                                       *
*                                                                   *
* Return        :       1 if string makes a valid number,           *
*                       zero otherwise.                             *
********************************************************************/

int check_valid_number(char *char_string)
{
        int     count, length;

/* count the number of character in the string */
        length = strlen(char_string);

/* go through each character and check whether it is a valid digit */
        for(count = 0; count < length; count++)
                if (!isdigit(*(char_string + count)))
                        return 0;

/* return 1 if it is a valid number */
        return 1;
}
/* end of check_valid_number */




>From: Roman Black <fastvid@EZY.NET.AU>
>Reply-To: pic microcontroller discussion list <PICLIST@MITVMA.MIT.EDU>
>To: PICLIST@MITVMA.MIT.EDU
>Subject: Re: [OT]: Beginner C question
>Date: Mon, 30 Apr 2001 02:35:13 +1000
>
>Mark Benson wrote:
> >
> > >> Global variables are indeed bad form and should be avoided whenever
> > >> possible.
>
> > >I can see the point here, but again, usually not a problem on a PIC
>based
> > >project -- ceratinly not any of mine.
>
>
>At the risk of sounding argumentative, surely all
>tools are best used by a skilled person. Like a
>screwdriver SHOULD be used to turn screws, but I
>feel real justified also using one to open a tin of
>paint.:o)
>
>When I worked on a PC programming team my job was
>to make the graphics engine and small utilities, and
>yes I used globals when they were best and even gotos.
>I also made the fastest and smallest C code out of the
>group. And it worked well.
>
>Some carpenters swear by the nail gun and do great
>work, other use nothing but glued dowel pins, both
>think they are right...
>
>So especially on a PIC forum where most programs
>are small and specialised the university model
>of "globals==bad || gotos==bad" must be considered
>as just a starting point, not the meaning of life.
>I think in all fields the rules you teach an
>impressionable student are very different to the
>rules an experienced professional lives by. :o)
>-Roman
>
>--
>http://www.piclist.com hint: The PICList is archived three different
>ways.  See http://www.piclist.com/#archives for details.
>
>

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