code>toExponential</code> form,
      with the decimal point to be positioned after the most significant
      (left-most) digit of the coefficient.
    </p>
    <p>
      Note that, as with JavaScript numbers, the original exponent and
      fractional trailing zeros are not preserved.
    </p>
    <pre>x = new BigNumber(0.123)              // '0.123'
x.toExponential()                     // '1.23e-1'
x.c                                   // '1,2,3'
x.e                                   // -1
x.s          