Re: number comparison with a twist

Supposing your float has always exactly two decimal points

I'd convert the textual float to textual cents by eliminating the dot .

Like this you'll only deal with integers.

I might even try to only use eq for comparison then, but this depends on the accuracy of your format (leading zeroes and so on)

Cheers Rolf
_{(addicted to the Perl Programming Language :)

Wikisyntax for the Monastery}

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Re^2: number comparison with a twist by Marshall (Canon) on Mar 05, 2020 at 04:10 UTC
I like this answer. The input is NOT a float, it is a string of decimal digits which could potentially be represented by a binary float. I would move the decimal 2 places to the right, 12.=>1200, 12.3=>1230 and see if any non-zero digits remain. If so, there are going to be problems when comparing numbers. I would not convert "12.30" to a float unless you have to. This API is giving the OP a decimal character string instead of a much more compact, efficient binary float. I suspect that there are reasons behind that the OP hasn't told us. This string could have come from some BCD (Binary Coded Decimal) calculation or whatever. I have never written any BCD code, but yes there are math operations that modern processors can do on arrays of BCD's (every 4 bits only goes 0-9 instead of 0-F).	[reply]

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Re^2: number comparison with a twist
by Marshall (Canon) on Mar 05, 2020 at 04:10 UTC

This API is giving the OP a decimal character string instead of a much more compact, efficient binary float. I suspect that there are reasons behind that the OP hasn't told us. This string could have come from some BCD (Binary Coded Decimal) calculation or whatever. I have never written any BCD code, but yes there are math operations that modern processors can do on arrays of BCD's (every 4 bits only goes 0-9 instead of 0-F).

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