编程求大神相助 - 编程论坛

xydddaxia2014-12-22 20:06

程序代码：

public class class1
{
    public double Fun(int n, double x)
    {
        double sum = 0;
        int flag = 1;
        for (int i = 1; i <= n; i++)
        {
            sum += flag * Math.Pow(x, 2 * i - 1) / (fac(2 * i - 1) * 1.0);
            flag = flag * (-1);
        }
        return sum;
    }
    private double fac(int n)
    {
        if (n == 1)
        {
            return 1;
        }
        return n * fac(n - 1);
    }
}

//调用

class1 c1 = new class1();
double d1 = c1.Fun(10, 2.5);