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  1. or download this
    #include "EXTERN.h"
#include "perl.h"
#include "XSUB.h"
...
        int           iReturn
    OUTPUT:
        iReturn
  2. or download this
    #include "TestInclude.h"

void C_function(int    iReturn)
{
    iReturn = 5;
}
  3. or download this
    package TEST;

require Exporter;
...

bootstrap TEST;
1;
  4. or download this
    use TEST;

$Code = 25;
C_function($Code);
printf("Return Code:  %d\n", $Code);