Math对象

class Program
{
    static void Main(string[] args)
    {
        //c#中提供一个用于数学运算的静态类Math
        //圆周率
        Console.WriteLine(Math.PI);
        //自然对数的底数
        Console.WriteLine(Math.E);
        //求绝对值
        Console.WriteLine(Math.Abs(-10));
        //平方根
        Console.WriteLine(Math.Sqrt(16));
        //四舍五入
        Console.WriteLine(Math.Round(3.145,2));
        //上取整
        Console.WriteLine(Math.Ceiling(3.14));
        //下取整
        Console.WriteLine(Math.Floor(3.14));
        //比较
        Console.WriteLine(Math.Max(5,10));//大
        Console.WriteLine(Math.Min(5,10));//小

        //幂运算
        Console.WriteLine(Math.Pow(2,3));
        //对数:以2为底,返回8的对数
        Console.WriteLine(Math.Log(8,2));

        //三角函数 
        Console.WriteLine(Math.Sin(Math.PI/2)); //正弦函数  1
        Console.WriteLine(Math.Cos(0));//余弦函数  1
        Console.WriteLine(Math.Tan(Math.PI/4));//正切函数  1

        Console.WriteLine(Math2.Sum(10,20,30,40));
    }
}