抽象类判断日期能否被2整除

    public abstract class modA
    {
        public abstract int datetimeforday();

        protected string str = string.Empty;
        public string iloveyou(int type)
        {
            switch (type)
            {
                case 0:
                    str= "能被2整除";
                    break;
                case 1:
                    str ="不能被整除";
                    break;
            }
            return str;
        }
    }

    public class modB:modA
    {
        public override int datetimeforday()
        {
            int i = -1;
            i = (int)DateTime.Now.Day;
            return i;
        }
    }