/*  AGS 3.46 */

/* mymodul.h */
typedef struct t_person {
  char name[21], vname[21];
} person;

void f1(int x[], int *y);
person f2(int x);

/* mymodul.c */
#include "mymodul.h"
...

void f1(int x[], int *y) {
  ...
}

person f2(int x) {
  person a;
  ...
  return a;
}