This C program uses enumerated types to display days of week. The enumerated type is then declared as a different name using typedef keyword i.e. enum days to typedef enum days days
The function prints for each day of the week, today, yesterday, and tomorrow, both as a string and as a number.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 | #include <stdio.h> /* Introducing an enumerated data type */ enum days { monday, tuesday, wednesday, thursday, friday, saturday, sunday}; typedef enum days days; // This allows us to use "days" as an abbreviation // for "enum days" /* Two useful functions */ days yesterday(days today){ return (today + 6) % 7; } days tomorrow(days today){ return (today + 1) % 7; } // A useful array: thedays is an array of constant (i.e. you cannot // modify them) pointers to constant (i.e. you cannot modify them) strings const char * const thedays[] = { "monday", "tuesday", "wednesday", "thursday", "friday", "saturday", "sunday" }; int main(void){ days today; printf("today \tyesterday \ttomorrow\n ============================================\n"); for (today=monday;today<=sunday;today++) printf("%s = %d \t %s = %d \t %s = %d\n", thedays[today], today, thedays[yesterday(today)], yesterday(today), thedays[tomorrow(today)], tomorrow(today)); } |
The output of the above program is
1 2 3 4 5 6 7 8 9 | today yesterday tomorrow ============================================ monday = 0 sunday = 6 tuesday = 1 tuesday = 1 monday = 0 wednesday = 2 wednesday = 2 tuesday = 1 thursday = 3 thursday = 3 wednesday = 2 friday = 4 friday = 4 thursday = 3 saturday = 5 saturday = 5 friday = 4 sunday = 6 sunday = 6 saturday = 5 monday = 0 |
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