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<title>GNU Scientific Library &ndash; Reference Manual: Combination Examples</title>

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<a name="Combination-Examples"></a>
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<p>
Next: <a href="Combination-References-and-Further-Reading.html#Combination-References-and-Further-Reading" accesskey="n" rel="next">Combination References and Further Reading</a>, Previous: <a href="Reading-and-writing-combinations.html#Reading-and-writing-combinations" accesskey="p" rel="previous">Reading and writing combinations</a>, Up: <a href="Combinations.html#Combinations" accesskey="u" rel="up">Combinations</a> &nbsp; [<a href="Function-Index.html#Function-Index" title="Index" rel="index">Index</a>]</p>
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<hr>
<a name="Examples-4"></a>
<h3 class="section">10.7 Examples</h3>
<p>The example program below prints all subsets of the set
<em>{0,1,2,3}</em> ordered by size.  Subsets of the same size are
ordered lexicographically.
</p>
<div class="example">
<pre class="verbatim">#include &lt;stdio.h&gt;
#include &lt;gsl/gsl_combination.h&gt;

int 
main (void) 
{
  gsl_combination * c;
  size_t i;

  printf (&quot;All subsets of {0,1,2,3} by size:\n&quot;) ;
  for (i = 0; i &lt;= 4; i++)
    {
      c = gsl_combination_calloc (4, i);
      do
        {
          printf (&quot;{&quot;);
          gsl_combination_fprintf (stdout, c, &quot; %u&quot;);
          printf (&quot; }\n&quot;);
        }
      while (gsl_combination_next (c) == GSL_SUCCESS);
      gsl_combination_free (c);
    }

  return 0;
}
</pre></div>

<p>Here is the output from the program,
</p>
<div class="example">
<pre class="example">$ ./a.out 
</pre><pre class="verbatim">All subsets of {0,1,2,3} by size:
{ }
{ 0 }
{ 1 }
{ 2 }
{ 3 }
{ 0 1 }
{ 0 2 }
{ 0 3 }
{ 1 2 }
{ 1 3 }
{ 2 3 }
{ 0 1 2 }
{ 0 1 3 }
{ 0 2 3 }
{ 1 2 3 }
{ 0 1 2 3 }
</pre></div>

<p>All 16 subsets are generated, and the subsets of each size are sorted
lexicographically.
</p>




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