Java math is totally not working!

Hi! Ok for some homework I'm doing I've got to like, do some math stuff :(
I do this
double d = 3.1 - 2.2;
System.out.println(d);
and it prints out 0.8999999999999999. I like, did the same thing on my calculator and it told me the answer is 0.9! Hello!? I'm not really good at that math stuff but my calculator answer like, looks much better! Help me pls!
Thanx!
JS

Maybe I should change my ID? I thought when I signed
up that you had to like, use your real name! It's not
my fault there's another Jessica Simpson! I might
change to another ID then ppl won't know it's me and
might not be so mean!
JSHey Jessica, I like, did not like, intend to be like, mean. I have like, been following your like, threads for a long time. :)
Anyway, using a new name means new trouble. Now, everyone enjoys your presence since they know you. If you come in with a different name, they would flame you instead. ;)
DM :)

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