`isNan` in Objective-C
ios, nan, objective-c
Solution
Try just adding
#include <math.h>
and then using the standard `isnan()` function to test.
You can also use the "trick" that NaN is not equal to anything, including itself:
double x;
// do some operation here
x = doSomething();
if (x != x)
printf("%g is probably NaN, it's not equal to itself\n", x);
Problem
Is there a function like `isNan` (Javascript example) for Objective-C? I just noticed this code is causing to display `Nan %`, so I need to detect is a value is NAN so I could change it to `0`. ``` [portefeuillePercentWaarde setText:[NSString stringWithFormat:@"%.2f%%", verschilPrencentage]]; ```