[TheDubWubCub]

Hello HF! :D

I hope one of you can help me with this annoying problem!

If you perform: -3 Mod 64 the actual answer is: 61

However, in my vb code, it remains: -3

Code:

msgbox( -3 Mod 64 )

Am I some how doing something wrong, hope you guys can help me! Thank you! :D

[$lick]

64 - 3 ?

Don't get what you have an issue with

please explain more

[TheDubWubCub]

64 - 3 ?

Don't get what you have an issue with

please explain more

I have an application that will do some math to two numbers and then finally mod 64 to it.
Sometimes the final number is positive and sometimes negative.
When it's positive, everything works fine, 76 mod 64 = 12.
When it's negative, it doesn't do anything to it, but from your response I hope it is just simply subtracting it, is that really all i need to do?

example:

if x < 0 then
msgbox( 64 - x )

elseif x > 0 then

msgbox( x mod 64)

end if

Another thing to say, why do other calculations of -3 mod 64 = 61 and in vb it = -3?

Thanks for your response btw! :D

[Temploit]

Here is the problem:
x mod y = x - (trunctate(x / y) y)

Say x = -3 and y = 64:
-3 / 64 = -0.046875
trunctate(-0.046875) = 0
0 64 = 0
therefore:
-3 - 0 = -3
Conclusion:
-3 mod 64 = -3

----
HOWEVER:

Some mod's use floor instead of trunctate:
Say x = -3 and y = 64:
-3 / 64 = -0.046875
floor(-0.046875) = -1
-1 * 64 = -64
therefore:
-3 - -64 = 61
Conclusion:
-3 mod 64 = 61
--
See the difference?

---

Use this function:

PHP Code


<?php 
Function _mod(ByVal x As Double, ByVal y As Double) As Double
      Return x - (Math.Floor(x / y) * y)
    End Function 


[TheDubWubCub]

Here is the problem:
x mod y = x - (trunctate(x / y) y)

Say x = -3 and y = 64:
-3 / 64 = -0.046875
trunctate(-0.046875) = 0
0 64 = 0
therefore:
-3 - 0 = -3
Conclusion:
-3 mod 64 = -3

----
HOWEVER:

Some mod's use floor instead of trunctate:
Say x = -3 and y = 64:
-3 / 64 = -0.046875
floor(-0.046875) = -1
-1 * 64 = -64
therefore:
-3 - -64 = 61
Conclusion:
-3 mod 64 = 61
--
See the difference?

Thank you very much for shedding some light on this!

EDIT: Just saw your update, works perfectly! Thanks a ton!! :D