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<title>The GNU Fortran Compiler: MALLOC</title>
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<a name="MALLOC"></a>
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<p>
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Next: <a href="MASKL.html#MASKL" accesskey="n" rel="next">MASKL</a>, Previous: <a href="LTIME.html#LTIME" accesskey="p" rel="prev">LTIME</a>, Up: <a href="Intrinsic-Procedures.html#Intrinsic-Procedures" accesskey="u" rel="up">Intrinsic Procedures</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Option-Index.html#Option-Index" title="Index" rel="index">Index</a>]</p>
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<hr>
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<a name="MALLOC-_002d_002d_002d-Allocate-dynamic-memory"></a>
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<h3 class="section">9.176 <code>MALLOC</code> — Allocate dynamic memory</h3>
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<a name="index-MALLOC"></a>
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<a name="index-pointer_002c-cray-1"></a>
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<dl compact="compact">
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<dt><em>Description</em>:</dt>
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<dd><p><code>MALLOC(SIZE)</code> allocates <var>SIZE</var> bytes of dynamic memory and
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returns the address of the allocated memory. The <code>MALLOC</code> intrinsic
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is an extension intended to be used with Cray pointers, and is provided
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in GNU Fortran to allow the user to compile legacy code. For new code
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using Fortran 95 pointers, the memory allocation intrinsic is
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<code>ALLOCATE</code>.
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</p>
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</dd>
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<dt><em>Standard</em>:</dt>
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<dd><p>GNU extension
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</p>
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</dd>
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<dt><em>Class</em>:</dt>
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<dd><p>Function
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</p>
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</dd>
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<dt><em>Syntax</em>:</dt>
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<dd><p><code>PTR = MALLOC(SIZE)</code>
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</p>
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</dd>
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<dt><em>Arguments</em>:</dt>
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<dd><table>
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<tr><td width="15%"><var>SIZE</var></td><td width="70%">The type shall be <code>INTEGER</code>.</td></tr>
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</table>
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</dd>
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<dt><em>Return value</em>:</dt>
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<dd><p>The return value is of type <code>INTEGER(K)</code>, with <var>K</var> such that
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variables of type <code>INTEGER(K)</code> have the same size as
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C pointers (<code>sizeof(void *)</code>).
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</p>
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</dd>
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<dt><em>Example</em>:</dt>
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<dd><p>The following example demonstrates the use of <code>MALLOC</code> and
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<code>FREE</code> with Cray pointers.
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</p>
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<div class="smallexample">
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<pre class="smallexample">program test_malloc
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implicit none
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integer i
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real*8 x(*), z
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pointer(ptr_x,x)
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ptr_x = malloc(20*8)
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do i = 1, 20
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x(i) = sqrt(1.0d0 / i)
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end do
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z = 0
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do i = 1, 20
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z = z + x(i)
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print *, z
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end do
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call free(ptr_x)
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end program test_malloc
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</pre></div>
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</dd>
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<dt><em>See also</em>:</dt>
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<dd><p><a href="FREE.html#FREE">FREE</a>
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</p></dd>
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</dl>
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