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+<a name="Implicitly-convert-LOGICAL-and-INTEGER-values-1"></a>
+<h4 class="subsection">5.1.13 Implicitly convert <code>LOGICAL</code> and <code>INTEGER</code> values</h4>
+<a name="index-conversion_002c-to-integer"></a>
+<a name="index-conversion_002c-to-logical"></a>
+
+<p>As an extension for backwards compatibility with other compilers, GNU
+Fortran allows the implicit conversion of <code>LOGICAL</code> values to
+<code>INTEGER</code> values and vice versa. When converting from a
+<code>LOGICAL</code> to an <code>INTEGER</code>, <code>.FALSE.</code> is interpreted as
+zero, and <code>.TRUE.</code> is interpreted as one. When converting from
+<code>INTEGER</code> to <code>LOGICAL</code>, the value zero is interpreted as
+<code>.FALSE.</code> and any nonzero value is interpreted as <code>.TRUE.</code>.
+</p>
+<div class="smallexample">
+<pre class="smallexample"> LOGICAL :: l
+ l = 1
+</pre></div>
+<div class="smallexample">
+<pre class="smallexample"> INTEGER :: i
+ i = .TRUE.
+</pre></div>
+
+<p>However, there is no implicit conversion of <code>INTEGER</code> values in
+<code>if</code>-statements, nor of <code>LOGICAL</code> or <code>INTEGER</code> values
+in I/O operations.
+</p>
+
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