A fast, easy to use, free, and community supported 2D game engine
This should be simple but it won't work for me. I have a float that goes from 0.0 up to x.x. But when it goes to 1.0 and 2.0, I need to do something. I do a CCLOG now to see if it make it but it is never called.
I tried fmod and even (ceil(num) == floor(num)) but it never prints even though I see the number incrementing. Any ideas? I feel dumb.
mmm... try with this one:
float numberF;
int numberI = numberF;
if( (numberF - numberI) == 0 )
CCLOG(@"ends in 0");jd, you need to read up on floating point numbers and accuracy problems: http://en.wikipedia.org/wiki/Floating_point#Accuracy_problems
Basically, 2.0 is actually 2.00000000000000000000000001 (or something similar). If you ceil and floor it you'll and up with 2 == 3, which won't trigger.
Whenever you use floats, dont try do do anything with ==. Instead use something like this:
if (num > 1.99 && num < 2.01 && doneAlready == NO)
{
doneAlready = YES;
//Do what you need to do when num is 2.0
}Suppose there are some c functions for that, but you can try maybe with:
(int)(numberF * 10) == ( (int)numberF ) * 10
Modulus is not defined on floating point numbers, as floating point division does not result in a remainder.
vgatto
Member
If you declared the float yourself, just switch it to an int instead. You can represent the value 1.1f as 11, 1.2f as 12, etc. You'll avoid any rounding errors and detecting the transition can be done with modulus division as suggested above. You can convert it to a float for display or whatever else by dividing by 10.0f.
You must log in to post.
