Hello Interaction Nets!

$ cat >hello.in 
${
#include <stdio.h>
}$

\alpha {
        printf("%s %s!\n", LVAL, RVAL);
} \beta;

$$

\alpha_{"Hello"} = \beta_{"World"};

$$

#include <stdlib.h>

inagent *inaux(void *aux, void *offline)
{
        return NULL;
}

int main()
{
        interact();
        return 0;
}
$ inc <hello.in
$ c99 in.tab.c
$ ./a.out
Hello World!
$