Re: isnan
Re: isnan
- Subject: Re: isnan
- From: Greg Parker <email@hidden>
- Date: Thu, 2 Apr 2009 21:29:05 -0700
On Apr 2, 2009, at 9:19 PM, Development wrote:
I'm trying to detect if an entry in a uitextfield is a number or not
but isnan does not seem to work.
NSString * bLong = [NSString stringWithFormat:@"%@",maLong.text];
NSString * bLat = [NSString stringWithFormat:@"%@",maLat.text];
if(isnan([bLat floatValue]) || isnan([bLong floatValue])){
return;
}
What am I doing wrong here?
isnan() looks for IEEE-754 NaN values, but -[NSString floatValue]
returns 0.0 if the string doesn't start with a number.
There's no way to tell whether -floatValue found a good number or not.
Use NSScanner's -scanFloat: to convert a string to a number and also
identify invalid input.
--
Greg Parker email@hidden Runtime Wragler
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| | >isnan (From: Development <email@hidden>) |