public static double mod(double x, double y) { return x - y * System.Math.Floor(x/y); }
public static bool is_leap_year(int year) { if (CCMath.mod(year, 4) != 0) { return(false); } int num = CCMath.mod(year, 400); return(num != 100 && num != 200 && num != 300); }