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  1. or download this
    $ perl -e'printf "%.20e\n", 1.255'
1.25499999999999989342e+00

$ perl -e'printf "%.20e\n", (1.255 * 100 + 0.5) * 10000000'
1.25999999999999976158e+09
  2. or download this
    int(1259999999.999999)              = 1259999999
int((1.255 * 100 + 0.5) * 10000000) = 1256000000
  3. or download this
    ( $j = sprintf("%.6f", $j) ) =~ s/\..*//s;