C-Plus-Plus/others/easter.cpp

// You can read more about the reason behind the algorithm itself here:
// https://en.wikipedia.org/wiki/Date_of_Easter

  /* Testing data:
 * 2003 - 20th of April (4/20) - Passed
 * 1830 - 11th of April (4/11) - Passed
 * 2020 - 12th of April (4/12) - Passed
 * 1910 - 27th of March (3/27) - Passed
 */

class easter 
{
 public:
    static void FindEaster(int y) 
    {
        if (y > 1582) 
        {
            // Calculations (It's not worth going into detail and naming each of these differently)
            int a = y % 19;
            int b = y / 100;
            int c = y % 100;
            int d = b / 4;
            int e = b % 4;
            int f = (b + 8) / 25;
            int g = (b - f + 1) / 3;
            int h = (19 * a + b - d - g + 15) % 30;
            int i = c / 4;
            int k = c % 4;
            int r = (32 + 2 * e + 2 * i - h - k) % 7;
            int m = (a + 11 * h + 22 * r) / 451;
            int n = (h + r - 7 * m + 114) / 31;
            int p = (h + r - 7 * m + 114) % 31;

            // Print date
            cout << "Easter in " + y + " falls on " + n + "/" +
                               (p + 1) + ".");
        } 
        else 
        {
            return;
        }
    }
}