Then store the value as a string, an integer, or something else that will remain exact. If you put it in a floating point value (in Perl, Access, ODBC or whatever) then you will not get the exact value back, except in cases where the binary and decimal representations have the same value (such as zero).
As to the second point, this is not correctable, on any level. You can get closer to exact values by using more bits (thus the attraction of double over float) but the phenomenon is inherent to floating point representation in binary, not to any of the languages mentioned.
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