title: Can you give to me a 16 digits (or more) decimal number that converted in double precision floating point round correctly only at 15th?
body: <p>For single precision, min digits guarantee are <strong>6</strong>.</p>
  
  <p>i.e. both <code>9999978e3</code> and <code>9999979e3</code> will "converge" to <code>9999978496</code>.
  So whatever decimal I'll use, <strong>6</strong> digits are always guarantee by the single precision floating point math (at least, for <code>IEEE 754</code>).</p>
  
  <p>The same I think apply for double precision, but the min value should be <strong>15</strong>. I can't find a decimal number that proof this, as for above that use single precision.</p>
  
  <p>Can you give to me one? Or how would you retrieve it?</p>