Maths errors

neilo

(Posted 2006) [#1]

Consider the following code:

Local a,b,c

a=64
b=a^2
c=a*a

If b=c
	Print "All ok!"
Else
	Print "WTF?!"
EndIf

If I compile and run, b!=c (in fact, b is 4095 whereas c is 4096).

If I modify the code as such

Local a:Float,b:Float,c:Float

a=64
b=a^2
c=a*a

If b=c
	Print "All ok!"
Else
	Print "WTF?!"
EndIf

all is well.

If this some sort of integer or type coersion bug?

Neil

Perturbatio

(Posted 2006) [#2]

^ returns a floating point number, not an integer so floating point precision is failing you in this example.

You could of course do:


Local a:Int,b:Int,c:Int

a=64
b=Ceil(a^2)
c = a * a


If b=c
	Print "All ok!"
Else
	Print "WTF?!"
EndIf