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Diffstat (limited to 'test/gourdinl/c/enum2.c')
| -rw-r--r-- | test/gourdinl/c/enum2.c | 50 |
1 files changed, 50 insertions, 0 deletions
diff --git a/test/gourdinl/c/enum2.c b/test/gourdinl/c/enum2.c new file mode 100644 index 00000000..a18acb80 --- /dev/null +++ b/test/gourdinl/c/enum2.c @@ -0,0 +1,50 @@ +/* enum2.c -- Starting to use enumerated types: Printing for each + * day of the week, today, yesterday, and tomorrow, both + * as a string and as a number. We use typedef + */ + +#include <stdio.h> + +/* Introducing an enumerated data type */ +typedef enum {monday,tuesday,wednesday,thursday,friday,saturday,sunday} days; + +/* Two useful functions */ +days yesterday(days today); +days tomorrow(days today); + +char *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)); +} + +days yesterday(days today){ + return (today+6)%7; +} +days tomorrow(days today){ + return (today+1)%7; +} + +/* + The output is: + +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 + +*/ |