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

Today I stumbled across the following piece of code and I'm still wondering why the condition is not met:
my $a = 36.8; my $b = 36.6; if( $a >= ( $b + 0.2 ) ) { print "true\n"; }
=> returns nothing (Why's that? 36.8 equals 36.6 + 0.2)

Whereas the condition becomes true if I change the values a little bit:
my $a = 6.8; my $b = 6.6; if( $a >= ( $b + 0.2 ) ) { print "true\n"; }
=> returns "true" (that's what i expected)

I feel a little bit stupid asking this question and have the strange feeling that my mind is playing a trick on me here because I've been doing perl stuff since many years now. Must have got something to do with floating point values and the "greater or equal than" operator, I guess.

Could somebody please tell me why the above code fragments work like they do and not how I think they should work?