Solved: Long vs Double data type

[Digita]

Howdy,

Can somebody please explain why the use of double and long data type produces different results in this situation:

[vba]Dim a As Double
a = 63 * 0.15
Debug.Print IIf(a = Int(a), a, Int(a) + 1)[/vba]

and

[vba]Dim a As Long
a = 63 * 0.15
Debug.Print IIf(a = Int(a), a, Int(a) + 1)[/vba]



kp

[Aussiebear]

Hi Digita, Its my understanding the Double variables are stored as a Double precision floating point (64 bit 8 byte) value where as Long variables are stored as (32 bit 4 byte) values.

[Digita]

Thanks Aussiebear for quick reply.

Just one last question - is it true that Long variables are good for speed and Doubles for greater accuracy?

Cheers


kp

[Aussiebear]

I believe so

[Digita]

Awesome. Thanks Aussiebear.

Have a great weekend.

[mikerickson]

Long variables are as accurate as Double, when the result is a Long.

[Digita]

Hi Mikerickson,

Which function can be used to make the result long?

Thanks in advance.


kp

[mdmackillop]

Basically, Long holds only integer values, Double and Single will take decimals

[vba]
Option Explicit
Sub Test()
Const C = 123.456789123458
Dim L As Long
Dim D As Double
Dim S As Single
L = C
D = C
S = C
MsgBox "Long = " & L & vbCr & "Single = " & S & vbCr & "Double = " & D
End Sub


[/vba]

[Digita]

Thanks Mal.