Obtient le jour de Pâques d'une année donnée / get easter day for a given year

jourpaques.cs

public static DateTime JourDePaques(int year)
{
    int a, b, C, P, E, F, g, h, i, K, N, Y, r, M, D;
    Y = year;
    a = fmod(Y, 19);
    b = (int)(Y / 100);
    C = fmod(Y, 100);
    P = (int)(b / 4);
    E = fmod(b, 4);
    F = (int)((b + 8) / 25);
    g = (int)((b - F + 1) / 3);
    h = fmod(19 * a + b - P - g + 15, 30);
    i = (int)(C / 4);
    K = fmod(C, 4);
    r = fmod(32 + 2 * E + 2 * i - h - K, 7);
    N = (int)((a + 11 * h + 22 * r) / 451);
    M = (int)((h + r - 7 * N + 114) / 31);
    D = fmod(h + r - 7 * N + 114, 31) + 1;
    return new DateTime(year, M, D);
}
 
private static int fmod(int a, int b)
{
    return (a - b * (int)(a / b));
}