use v5.30.2; use strict; use warnings; my $float = 12.1212; $float -= 12; $float -= 0.1212; say $float; # =>-2.77555756156289e-17 my $floti = 0; $floti += 12.1212; $floti -= 12; $floti -= 0.1212; say $floti; # => -2.77555756156289e-17 my $flotter = 12.1212; my $flotteur = $flotter - 12; my $flottera = $flotteur - 0.1212; say $flottera; # => -2.77555756156289e-17 use bignum; my $ok_float = 12.1212; $ok_float -= 12; $ok_float -= 0.1212; say ''; say 'Youpi, solved it:'; say $ok_float;