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Tried to get For loop granularity, ended up with recurring floaters.

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I am formulating some ingredients for an in sect repellent and I am looking for results where by each component ingredient has no more than 2 decimal places. I have that done but instead of going up 1 gram at a time I decided to try and go up a 10th of a gram at a time, here's a simple count:

For $a = 0 To 100 Step 0.1
    ConsoleWrite($a & @CRLF)

What I get instead is by the time it reaches 6.9, it should go to 7 but it goes:


I cannot make sense of it. I know once my loop gets to 100 gram area it always is a match but this for loop never yielded any results for me. Only when I added a consolewrite for the loop variable counter did I see this weirdness above.

Does anyone know what is going on?

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Google "floating point arithmetic" - or search the forum as this has been discussed before many, many times.

Simple solution - make all of the loops increase in integers and do some division inside the calulations.


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... that is:

For $a = 0 * 10 To 100 * 10 Step 0.1 * 10
    ConsoleWrite($a / 10 & @CRLF)


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