角弧度互换

 //角度、弧度互化计算类
    class jiaodu2hudu
    {
        public double dms_rad(double a) //角度转弧度
        {
            double sign = (a < 0) ? -1.0 : 1.0;
            a = System.Math.Abs(a);

            int dd = (int)(System.Math.Floor(a));
            a = a - dd;

            int mm = (int)System.Math.Floor(a * 100.0);
            a = (a * 100.0 - mm) * 100.0;

            a = sign * (dd * 3600.0 + mm * 60.0 + a) * (Math.PI / (180 * 3600));
            return a;
        }

        public double rad_dms(double a) //弧度转角度
        {
            double sign = (a < 0) ? -1.0 : 1.0;
            a = System.Math.Abs(a);
            a = a * 57.2957795130823;

            int d = (int)(System.Math.Floor(a));
            a = a - d;
            int m = (int)System.Math.Floor(a * 60.0);
            a = (a - m / 60.0) * 3600.0;
            if (a + 0.0001 > 60) { a = 0; m = m + 1; }
            if (m >= 60) { m = 0; d = d + 1; }
            a = d + m / 100.0 + a / 10000.0;
            return a*sign;
        }

    }