#include <stdlib.h>

#include "01-typedef.h"

int main( int argc, char *argv[] ) {

  //-----------------------------------------
  // using the int types
  //-----------------------------------------
  
  int i = 0;
  StudentNumber sn = 1234567;

  i = sn;    // OK
  sn = i;    // OK
  sn = 2.2;  // OK

  //-----------------------------------------
  // using the struct types
  //-----------------------------------------

  struct student_t  alice;
  Student           bob;
  Student2          charlie;
  
  // are these legal?
  alice = bob;      // struct student_t = Student         OK
  bob = charlie;    //  Student = Student2                   OK


  //-----------------------------------------
  // trying to use structurally equivalent
  // struct types
  //-----------------------------------------
  
  // here frank is a variable of an anonymous struct type
  // that is idential to struct student_t
  struct {
    char          *name;
    StudentNumber id;
  } frank;    // creates a variable frank of an anonymous struct type

  frank = alice;   // struct {} = struct student_t         NOT OK
  frank = frank;   // avoid "frank set but not used" compiler warning
      
  return EXIT_SUCCESS;
}