PowerShell math wrong -


why powershell seem give me wrong answers when answer between 0 , 1?

ps c:\users\me> 31.2 - 31 0.199999999999999   <<< wrong ps c:\users\me> 31.2 - 30 1.2                 <<< right ps c:\users\me>  31.2 % 10 1.2                 <<< right ps c:\users\me> 30.2 % 10 0.199999999999999   <<< wrong ps c:\users\me> 30.2 / 151 0.2                 <<< right

you need use [decimal] man-in-the-street math.

[decimal]31.2 - [decimal]31

or 

31.2d - 31

numeric literals default double, can't represent many decimals (because require repeating fractions, involve rounding errors, etc)

ref: https://devcentral.f5.com/articles/powershell-abcs-t-is-for-type-literals


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