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  1. or download this
    printf("%.16e\n", $dollar1);
printf("%.16e\n", $dollar2);
  2. or download this
    >perl -le"printf '%.16e', 0.1"
1.0000000000000001e-001
                 ^
                 |
  3. or download this
    if (sprintf('%.2f', $dollar1) ne sprintf('%.2f', $dollar2)) {
  print "$dollar1 != $dollar2\n";
}
  4. or download this
    if ($cents1 != $cents2)) {
  print $cents1/100, ' != ', $cents2/100, "\n";
}