WTF ?

[Paul Orrock]

I've tried this on a couple of machines running perl 5.8.6 and 5.8.8

for ($i=1.2;$i<4;$i+=0.05) {
print $i . "\n";
}

Starts off fine, I get

1.2
1.25
1.3 etc

Suddenly I get

3.4
3.45
3.5
3.54999999999999
3.59999999999999
3.64999999999999
3.69999999999999

Can anyone explain why this is ? I get the correct (in my eyes) 1dp / 
2dp result with 0.04 and 0.06 but 0.05 ends up to 14dp ?

Yours confusedly,

Paul