How I can Coding in c plus plus of a program that input date and display the day?

Answer 1

One way to determine the day of week based on the date is to use Zeller's congruence. For the Gregorian calendar...

int dayofweek (int month, int day, int year) {

int weekday;

if (month < 3) month += 12;

weekday = day;

weekday += int ((month + 1) * 26 / 10);

weekday += year;

weekday += int (year / 4);

weekday += 6 * int (year / 100);

weekday += int (year / 400);

weekday %= 7;

return weekday; /* 0 = Sunday, ..., 6 = Saturday */

}