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How to check for NaN value in Objective-C (iOS) [duplicate]

Possible Duplicates:
Objective-C - float checking for nan
Determine if NSNumber is NaN

I have a problem with NaN values in CGFloat, how can I check if the number is valid?

the only way so far that works is:

if ([[NSString stringWithFormat:@"%f", output] isEqualToString:@"nan"]) {     output = 0; } 

which is not a nice solution at all! :) ... and I am pretty sure that there is something else I should do instead.

like image 605
Ondrej Rafaj Avatar asked Jun 02 '11 21:06

Ondrej Rafaj


1 Answers

There is a define for checking if a number is nan inf etc in math.h (you can use it without import I think).

isnan(myValue) 

if you follow the define you will end up with

(x!=x) 

there are also some other useful defines like isinf, isnormal , isfinite , ...

like image 138
thomas Avatar answered Sep 23 '22 08:09

thomas