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I certainly don't think the functions offered by Edja and DDRM have any place here at all. Their contributions were well-meaning but have sent you in the wrong direction.
True. Your further questions "unfolded" an objective that was clearly different. Eddy
Your further questions "unfolded" an objective that was clearly different.
The OP was no doubt trying to be helpful by distilling his problem down to what he thought were the basics. I encourage that, but there is a danger - as happened here - that the true objective will not be conveyed accurately.
Part of the problem is that the underlying issues are mathematical rather than specifically to do with programming. It's fundamental that 'rounding to two decimal places' has no well-defined meaning when applied to a number represented in binary floating-point. Indeed the concept of 'decimal places' only really applies to decimal numbers!
That is precisely why the built-in rounding functionality in BBC BASIC (in STR$ or in FNusing, which uses STR$ to do the work) happens only when converting a binary number to a decimal number.
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