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<h4 class="subsection">6.1.8 <code>Q</code> exponent-letter</h4>
<p><a name="index-g_t_0040code_007bQ_007d-exponent_002dletter-310"></a>
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 suppports 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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