Hi,
VT_R4: 7.850 -> VarRound(1) -> 7.800 VT_R4: 7.851 -> VarRound(1) -> 7.900 Is this the binary representation (in)accuracy?
MS state that rounding is dependent on the internal binary representation of the number and thus VarRound doesn't always get it right, i.e. you can't tell with any certainty what the result will be. You have 2 choices: try and match their exact algorithm (v. hard w/o reverse engineering) or use the dutch rounding method (this makes more sense IMO).
How can I test if the rounding worked ok when the numbers may differ in the last (invisible) bits?
As long as Wine does the right thing don't worry about it.
And how should I round a currency? It's valid on Windows but I couldn't interpret the results. Is this some kind of fixed comma type?
The currency value is multiplied by 10000 and stored in an I8 (See the VarCy* functions). So it has 4 dp of precision. To round to:
4 dp or more => no op. 0 dp => / 10000, then * 10000 1 dp => / 1000, then * 1000 2 dp => / 100, then * 100 3 dp => / 10, then * 10
mults and divs should be done on the I8 directly (no float).
Cheers, Jon
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