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| /* mktime example: weekday calculator */ #include <stdio.h> /* printf, scanf */ #include <time.h> /* time_t, struct tm, time, mktime */ int main () { time_t rawtime; struct tm * timeinfo; int year, month ,day; const char * weekday[] = { "Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"}; /* prompt user for date */ printf ("Enter year: "); fflush(stdout); scanf ("%d",&year); printf ("Enter month: "); fflush(stdout); scanf ("%d",&month); printf ("Enter day: "); fflush(stdout); scanf ("%d",&day); /* get current timeinfo and modify it to the user's choice */ time ( &rawtime ); timeinfo = localtime ( &rawtime ); timeinfo->tm_year = year - 1900; timeinfo->tm_mon = month - 1; timeinfo->tm_mday = day; /* call mktime: timeinfo->tm_wday will be set */ mktime ( timeinfo ); printf ("That day is a %s.\n", weekday[timeinfo->tm_wday]); return 0; }
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