#include <stdio.h>

void inc (int *n)
{
  (*n)++ ;
}

int main ()
{
  void (*fp) (int *) ;		// function pointer

  fp = inc ;			// fp points to inc

  int a = 0 ;
  printf ("a vale %d\n", a) ;

  inc(&a) ;			// normal call
  printf ("a vale %d\n", a) ;

  fp(&a) ;			// call using the function pointer
  printf ("a vale %d\n", a) ;
}