C enum bitmask

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

typedef enum {
  Sunday = 0x01,
  Monday = 0x02,
  Tuesday = 0x04,
  Wednesday = 0x08,
  Thursday = 0x10,
  Friday = 0x20,
  Saturday = 0x40
} DaysSet;

char* days_str[] = {
  "Sunday",
  "Monday",
  "Tuesday",
  "Wednesday",
  "Thursday",
  "Friday",
  "Saturday"
};

DaysSet week_end = Sunday | Saturday;

int main() {


  int order;

  printf("Please enter the day of the week (0 to 6)\n");
  scanf("%d", &order);

  if (((1 << order) & week_end) > 0 ) {
    printf("%s is weekend\n", days_str[order]);
  } else {
    printf("%s is week\n", days_str[order]);
  }
  return EXIT_SUCCESS;
}