addition of 0.7 and 0.1 is not 0.8 CDbl / CStr vbs problem

Hello Group,

i have some vbs code here and would be happy if one of you could
describe whats wrong with it.
i just would like to make addition of 0.1 and 0.7 but the result just
surprises me everytime again.
btw. i work on a system with german number format.

IF ((CDbl("0,7")+CDbl("0,1"))=(CDbl("0,8"))) THEN
MSGBOX "0,7 + 0,1 = 0,8"
ELSE
MSGBOX "0,7 + 0,1 IS NOT 0,8"
END IF

the solution for this problem is:
IF (CDbl(CStr(CDbl("0,7")+CDbl("0,1")))=(CDbl("0,8"))) THEN
MSGBOX "0,7 + 0,1 = 0,8"
ELSE
MSGBOX "0,7 + 0,1 IS NOT 0,8"
END IF

but what to hell is going on ???

kindest regards,
Robin

btw. the same prob occures with 10,7 + 0,1

.

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