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  1. or download this
    C:\>perl -e "$x = 1.23456789012345e15; print $x;"
1.23456789012345e+15
...
1.23456789012345e+15
C:\>perl -e "$x = 1.2345678901234544e15; print $x;"
1.23456789012345e+15
  2. or download this
    C:\>perl -e "print 'different' if 1.23456789012345e15 != 1.23456789012
+3454e15;"
different
...
different
C:\>perl -e "print 'different' if 1.234567890123454e15 != 1.2345678901
+234544e15;"
different