Thanks Poj,

To have the sum as integer, the (number*100) has to be converted to an integer using round. 
use Math::Round qw/round/;

my @nr=('32431.19', '20', '-10', '-31800');
my $x=0;
foreach (@nr)
{ $x+=round($_*100);
  print "$_ => ".$x/100 ."\n";
}

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In reply to Re^2: Problems with number resolution by Anonymous Monk
in thread Problems with number resolution by Anonymous Monk

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