-void convert __P((char *));
-int main __P((int, char *[]));
-int number __P((const char *, int));
-void pfract __P((int));
-int unit __P((int, const char *));
-void usage __P((void)) __attribute__((__noreturn__));
+int main(int, char *[]);
+static void convert(char *);
+static int number(const char *, int);
+static void pfract(int);
+static int unit(int, const char *);
+static void usage(void) __dead;