Question

Is there a way to evaluate an enum? I have an enum that is incorporated into a struct:

typedef enum {MW, TR} days;

typedef struct {
  int hour, min;
} Time;

typedef struct {
  char Dept[5];
  int course, sect;
  days meet_days;
  Time start, end;
  char instr[20];
} sched_record;

My print statement for the enum is:

 data[i].meet_days == MW ? "MW" : "TR"

What I am trying to do is to get my typedef struct of sched_record to print only the records with say MW in it. My “menu” for the program is as follows:

 fread(data, sizeof(sched_record), MAX_RECORD, filePointer);
        fclose(filePointer);
        printf("Enter the Department or A for any Department: ");
        scanf("%s", tempDept);
        printf("Enter the Course or 0 for any course: ");
        scanf("%d", &tempCourse);
        printf("Enter the Days; M = MW, T = TTH or D=Don't Care: ");
        scanf("%s", tempDay);
        printf("Enter the Time; A=Mornings, P=Afternoons or D=Don't Care: ");
        scanf("%s", tempTime);

I got my sched_records to print out by time with a simple statement of:

 else if ((strcmp(tempDept, "A")==0) && tempCourse == 0 && (strcmp(tempDay, "D")==0) && (strcmp(tempTime, "P")==0)) {
                            if (data[i].start.hour >= 12) {  // <---Time comparison
                                printf("%s %d %d %2s %02d%02d %02d%02d %s\n", data[i].Dept, data[i].course, data[i].sect, data[i].meet_days == MW ? "MW" : "TR",
                                   data[i].start.hour, data[i].start.min, data[i].end.hour, data[i].end.min, data[i].instr);
                     }
                }

                else if ((strcmp(tempDept, "A")==0) && tempCourse == 0 && (strcmp(tempDay, "M")==0) && (strcmp(tempTime, "D")==0)) {
                        printf("\n%s %d", data[i].Dept, data[i].course);

I am wondering if there is a simple way like the time comparison to do the same with the enum. If so can someone show me?

Answer 1

You can compare enumerated values in the same way as any other integer variable:

if (data[i].meet_days == MW)
  .....

Or, if say you had an enumeration for all days:

enum days {Monday, Tuesday, Wednesday, Thursday, Friday, Saturday, Sunday};

then you can test ranges like this:

if (day >= Monday || day <= Friday)
  printf ("It's a weekday!\n");

Hope that helps.