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<h4 class="subsection">6.1.8 <code>Q</code> exponent-letter</h4>
<a name="index-Q-exponent_002dletter"></a>

<p>GNU Fortran accepts real literal constants with an exponent-letter
of <code>Q</code>, for example, <code>1.23Q45</code>.  The constant is interpreted
as a <code>REAL(16)</code> entity on targets that support this type.  If
the target does not support <code>REAL(16)</code> but has a <code>REAL(10)</code>
type, then the real-literal-constant will be interpreted as a
<code>REAL(10)</code> entity.  In the absence of <code>REAL(16)</code> and
<code>REAL(10)</code>, an error will occur.
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