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+<a name="BTEST-_002d_002d_002d-Bit-test-function"></a>
+<h3 class="section">8.51 <code>BTEST</code> &mdash; Bit test function</h3>
+<a name="index-BTEST"></a>
+<a name="index-BBTEST"></a>
+<a name="index-BITEST"></a>
+<a name="index-BJTEST"></a>
+<a name="index-BKTEST"></a>
+<a name="index-bits_002c-testing"></a>
+
+<dl compact="compact">
+<dt><em>Description</em>:</dt>
+<dd><p><code>BTEST(I,POS)</code> returns logical <code>.TRUE.</code> if the bit at <var>POS</var>
+in <var>I</var> is set.  The counting of the bits starts at 0.
+</p>
+</dd>
+<dt><em>Standard</em>:</dt>
+<dd><p>Fortran 90 and later, has overloads that are GNU extensions
+</p>
+</dd>
+<dt><em>Class</em>:</dt>
+<dd><p>Elemental function
+</p>
+</dd>
+<dt><em>Syntax</em>:</dt>
+<dd><p><code>RESULT = BTEST(I, POS)</code>
+</p>
+</dd>
+<dt><em>Arguments</em>:</dt>
+<dd><table>
+<tr><td width="15%"><var>I</var></td><td width="70%">The type shall be <code>INTEGER</code>.</td></tr>
+<tr><td width="15%"><var>POS</var></td><td width="70%">The type shall be <code>INTEGER</code>.</td></tr>
+</table>
+
+</dd>
+<dt><em>Return value</em>:</dt>
+<dd><p>The return value is of type <code>LOGICAL</code>
+</p>
+</dd>
+<dt><em>Example</em>:</dt>
+<dd><div class="smallexample">
+<pre class="smallexample">program test_btest
+    integer :: i = 32768 + 1024 + 64
+    integer :: pos
+    logical :: bool
+    do pos=0,16
+        bool = btest(i, pos) 
+        print *, pos, bool
+    end do
+end program test_btest
+</pre></div>
+
+</dd>
+<dt><em>Specific names</em>:</dt>
+<dd><table>
+<thead><tr><th width="21%">Name</th><th width="28%">Argument</th><th width="18%">Return type</th><th width="30%">Standard</th></tr></thead>
+<tr><td width="21%"><code>BTEST(I,POS)</code></td><td width="28%"><code>INTEGER I,POS</code></td><td width="18%"><code>LOGICAL</code></td><td width="30%">Fortran 95 and later</td></tr>
+<tr><td width="21%"><code>BBTEST(I,POS)</code></td><td width="28%"><code>INTEGER(1) I,POS</code></td><td width="18%"><code>LOGICAL(1)</code></td><td width="30%">GNU extension</td></tr>
+<tr><td width="21%"><code>BITEST(I,POS)</code></td><td width="28%"><code>INTEGER(2) I,POS</code></td><td width="18%"><code>LOGICAL(2)</code></td><td width="30%">GNU extension</td></tr>
+<tr><td width="21%"><code>BJTEST(I,POS)</code></td><td width="28%"><code>INTEGER(4) I,POS</code></td><td width="18%"><code>LOGICAL(4)</code></td><td width="30%">GNU extension</td></tr>
+<tr><td width="21%"><code>BKTEST(I,POS)</code></td><td width="28%"><code>INTEGER(8) I,POS</code></td><td width="18%"><code>LOGICAL(8)</code></td><td width="30%">GNU extension</td></tr>
+</table>
+</dd>
+</dl>
+
+
+
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