× The internal search function is temporarily non-functional. The current search engine is no longer viable and we are researching alternatives.
As a stop gap measure, we are using Google's custom search engine service.
If you know of an easy to use, open source, search engine ... please contact support@midrange.com.


  1.  Home
  2. C400-L
  3. October 2004

RE: Validating Numeric values

Well, you could loop byte by byte and call isdigit() function.

-----Original Message-----
Subject: [C400-L] Validating Numeric values

 
C is not my 'native' language, so I'm asking what the most efficient way
to validate a string as containing a numeric value is.  The ato?() and
sscanf() functions just stop when they encounter a non-numeric, but do
not tell you that they did.  

I need to verify that a string contains a valid numeric value.  (I.E. "
+100" not "1 + 00" nor even "1+00  ", let alone "BOB   ")  (ato?() &
sscanf() would return NULL or 1 in each case.)

As an Amazon Associate we earn from qualifying purchases.

This thread ...
Replies:
Follow On AppleNews
Return to Archive home page | Return to MIDRANGE.COM home page

This mailing list archive is Copyright 1997-2024 by midrange.com and David Gibbs as a compilation work. Use of the archive is restricted to research of a business or technical nature. Any other uses are prohibited. Full details are available on our policy page. If you have questions about this, please contact [javascript protected email address].

Operating expenses for this site are earned using the Amazon Associate program and Google Adsense.