#include <stdio.h>
#include <stdlib.h>

int sub(int argc, char *argv[]) {
  printf("sub(%d, ", argc);
  for (int i=0; i<argc; i++) printf("%s, ", argv[i]);
  printf (")\n");
  return 0;
}

int sub2(int argc, char *argv[]) {
  printf("sub2(%d, ", argc);
  for (int i=0; i<argc; i++) printf("%s, ", argv[i]);
  printf (")\n");
  return 0;
}

int sub3(int j) {
  printf("sub3(%d)\n", j);
  return 0;
}

int main(int argc, char *argv[]) {
  
  // create a function pointer TYPE 'main_t'
  typedef int (*main_t)(int, char *[]);
  // and now a variable of that type
  main_t  pFn;
  
  // create a VARIABLE pFn2
  int (*pFn2)(int, char *[]);

  pFn = sub; 
  pFn(argc, argv);

  pFn = sub2;
  pFn(argc, argv);

  pFn2 = pFn;
  pFn2(argc, argv);

  // now we do something we shouldn't
  pFn = (main_t)(void*)sub3;
  pFn(argc, argv);
  
  return EXIT_SUCCESS;
}