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Precise Calculation
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To
05/11/1997 02:12:04
General information
Forum:
Visual FoxPro
Category:
Other
Miscellaneous
Thread ID:
00058291
Message ID:
00058295
Views:
24
>I need to convert from local to foreign currency and vice vesa.
>The problem I faced was it wouldn't be accurate when converting the second
>time.
>
>First, I need to convert from foreign to local and store the result(in 2
>dec. places)
>into the table.
>The second time I want to convert from local(from table) to foreign and
>display on
>screen, but the result will not be the same as the original value.
>
>Eg:
> - where exchange rate 99.9999 format
>1st round - foreign $10.00 --> local $5.55 (store into table
>with ROUND( ) )
>2nd round - local $5.55 --> foreign $9.99 (should be $10.00
>originally)
>
>Any better ways to get more accurate results? Pls advise, thanks.
Alvin,

Do not store the values with 2 decimal places, store them with 4 or more decimal places, round them when you display or print them. This will give you higher accuracy in converting back and forth while still giving you 2 decimals in the display. The reason you are getting rounding errors is that you are throwing the accuracy away when you store only 2 decimal places.
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