What are enums?

a user defined type of named integer identifiers helps to make a program more readable

#include <stdio.h>

enum Day{Sun = 1, Mon = 2, Tue = 3, Wed = 4, Thu = 5, Fri = 6, Sat = 7}

int main(){

  enum Day today = sun;
  printf("%d\n", today);

  if (today == Sun || today == Sat)
  {
      printf("It's the weekend\n");
  }
  else{
    printf("I have to work\n");
  }

  return 0;
}