perlcgi has asked for the wisdom of the Perl Monks concerning the following question:

This is a basic Math question, I think :-) Any help really appreciated. I can't get the following to balance i.e. the total of all line_items ($unconverted_amount) once converted is different to the converted invoice total. Is there a solution? Maybe I don't need Math::BigFloat. The amounts are all in pennies.
sub convert { use Math::BigFloat; my %currency_conv_hash = (IEP=>"EUR",GBP=>"GBP",USD=>"USD",EUR=>"EUR", FFR=>"EUR", NLG=>"EUR", ESP=>"EUR", DEM=>"EUR", ITL=>"EUR", ATS=>"EUR" +, BEF=>"EUR", PTE=>"EUR" ); my %rate_hash = (IEP=>".787564",GBP=>"1",USD=>"1",EUR=>"1", FFR=>"6.55 +957",NLG=>"2.20371", ESP=>"166.386", DEM=>"1.95583", ITL=>"1936.27", +ATS=>"13.7603", BEF=>"16.11", PTE=>"200.482" ); my($source_currency, $unconverted_amount, $unconverted_total_amount) = + @_; my $rate=$rate_hash{$source_currency}; my $line_amount = Math::BigFloat->new($unconverted_amount/$rat +e); my $total_amount = Math::BigFloat->new($unconverted_total_amount +/$rate); return ($currency_conv_hash{$source_currency}, (sprintf "%.0f",$line_ +amount->fround(0)), (sprintf "%.0f",$total_amount->fround(0)) ); } Now when I later total all the line amounts i.e. what is returned by s +printf "%.0f",$line_amount>fround(0)), the total is out by a penny or + so when compared to (sprintf "%.0f",$total_amount->fround(0))
Any assistance hugely appreciated.