12/17   I am doing some simple subtraction on perl, and its generating
        output like 8.39999999999998, how do I fix this? Thanks.
        \_ Omg.  I can't believe people ask this shit.  Did you graduate
           from Cal with a CS degree?  You are a fucking disgrace.
           \_ There are a significant number of non-CS majors here.
              \_ There IS a significant number.  Fucking disgraces, all
                 of you.  Ugh.  Go die.
                 \_ Wrong, dumbass. "A number of ___" is a plural noun.
                    "Are" is correct.  Fucking disgrace.
           \_ Agreed.
        \_ you fix it by giving us example code or int($num + .5)
           \_ I am doing something very simple, reading some numbers into
              a variable, and subtract them. in my case, the number is
              595 - 586.84, which should give me 8.16, but perl output
              8.15999999999997, I need 8.16.... thanks...
              \_ Like the poster below said, numbers like 8.16 can't be
                 represented exactly in binary, so you'll always get some
                 error.  You can use $num = sprintf("%.2f", $num) to force
                 $num to have exactly two digits after the decimal point --
                 this also means that 8.5 will become 8.50, which is usually
                 what you want if you're dealing with money.
              \_ And what is the precise binary representation of .84 pray
                 tell?
        \_ Math::BigFloat
        \_ If there's a specific precision you want, use fixed-point math or
           round.