title: Out put format should be according to scientific notation
body: <p>In my program I am calculating large number of values and I want to write the calculated values according to scientific notation as an example it should be as follow. </p>
  
  <pre><code>0.16200000000    should be   1.6200000000e-01
  6.09756097560    should be   6.0975609756e+00
  </code></pre>
  
  <p>Which function results this out put. </p>