Re: NSString doubleValue and zero
Re: NSString doubleValue and zero
- Subject: Re: NSString doubleValue and zero
- From: olivier <email@hidden>
- Date: Tue, 18 Feb 2003 16:43:31 -0600
this works fine except if the string i pass in begin with a number and
ends with some extra character (e.g.: 123abc will return 123 as a
double value) where it states it is a valid number and remove the
character at the end.
Is there a way to change that behavior, so that it reject those.
olivier
On Tuesday, February 18, 2003, at 03:57 PM, Brian Webster wrote:
On Tuesday, February 18, 2003, at 03:30 PM,
email@hidden wrote:
I use the message doubleValue to get a number value out of a string.
If
the string is not a number then i need to store the string. My problem
is that if the string is not a number then doubleValue return 0.
But then how am i supposed to know when it is an actual number with
value 0 or a string that was not a number.
Any pointers appreciated
Take a look at NSScanner's scanDouble: method. Create a new scanner
for your string and use it to scan for your double, and it will return
you a BOOL saying whether it successfully scanned a number. If it
returns NO, you can just keep the string, otherwise keep the number.
--
Brian Webster
email@hidden
http://homepage.mac.com/bwebster
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