C# 一种求平方根的方法 立方根也可以 极大 极小都可以

不知道研究这些干啥，纯纯的浪费时间。。。

       public static double TQSquare(double number)
        {
            Random random1 = new Random(DateTime.Now.Millisecond);
            double x1 = 0, resultX1 = 0, diff = 9999999999, diffTemporary = 0;
            for (int i = 0; i < 654321; i++)
            {
                if (random1.Next(0, 100) % 2 == 0)
                {
                    x1 = resultX1 + random1.NextDouble() * 1000;
                }
                else
                {
                    x1 = resultX1 - random1.NextDouble() * 1000;
                }
                diffTemporary = Math.Abs(x1 * x1 - number);
                if (diffTemporary < diff)
                {
                    resultX1 = x1;
                    diff = diffTemporary;
                }
                if (diff<0.001)
                {
                    break;
                }
            }
            return Math.Abs(resultX1);
        }