//返回大于等于指定数字的最小整数
        double a = Math.Ceiling(0.000);//0;
        double b = Math.Ceiling(0.400);//1;
        double c = Math.Ceiling(0.600);//1;
        double d = Math.Ceiling(1.000);//1;
        double f = Math.Ceiling(1.400);//0;

        //返回小于或等于指定数字的最大整数

        double g = Math.Ceiling(0.000);//1;
        double h = Math.Ceiling(0.400);//1;
        double i = Math.Ceiling(0.600);//1;
        double j = Math.Ceiling(1.000);//1;
        double k = Math.Ceiling(1.100);//2;

        //返回余数

        double x = Math.IEEERemainder(5.0, 3.0);//-1;
       
        //求组数，求分组数，即将物品分组，加一减一原则

        int v = (6 - 1) / 5 + 1;// 2