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

#define ONE 1

// The usual use of enum.  Values start at 0 and are assigned sequentially.
// (So, GREEN == 0 and BLUE == 1.)
typedef enum color_t {GREEN, BLUE}  Color;

// The following enum is a bad idea.  It is NOT composed of 10, 11, 12, 13, 14.
// It simply defines TEN==10, ELEVEN==11, THIRTEEN==13, and RANGE_MAX==14
typedef enum {TEN=10, ELEVEN, THIRTEEN=13, RANGE_MAX} Range;

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

  printf("Enumerating Color's: ");
  for ( Color color = GREEN; color <= BLUE; color += ONE)  printf("%d ", color);
  printf("\n");

  printf("Enumerating Range: ");
  for ( Range i=TEN; i<=RANGE_MAX; i++ ) printf("%d ", i);
  printf("\n");

  // You'd probably like this to be an error, but it isn't!
  printf("Mixed use: ");
  for ( Color color = GREEN;  color < RANGE_MAX; color++ ) printf("%d ", color);
  printf("\n");

  
  return EXIT_SUCCESS;
}