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I just came across this piece of code:
Dim d As Double
For i = 1 To 10
d = d + 0.1
Next
MsgBox(d)
MsgBox(d = 1)
MsgBox(1 - d)
Can anyone explain me the reason for that? Why d is set to 1?
Floating point types and integer types cannot be compared directly, as their binary representations are different.
The result of adding
0.1ten times as a floating point type may well be a value that is close to 1, but not exactly.When comparing floating point values, you need to use a minimum value by which the values can differ and still be considered the same value (this value is normally known as the epsilon). This value depends on the application.
I suggest reading What Every Computer Scientist Should Know About Floating-Point Arithmetic for an in-depth discussion.
As for comaring
1to1.0– these are different types so will not compare to each other.