//      d01an Example Program Text
//      C# version, NAG Copyright 2008
using System;
using NagLibrary;
using System.Globalization;
namespace NagDotNetExamples
{
  public class D01ANE
  {
    public static int kount = 0;
    static void Main(String[] args)
    {
      StartExample();
    }
    public static void StartExample()
    {
      try
      {
        const int lw = 800;
        D01.D01AN_G gD01AN = new D01.D01AN_G(g);
        double a,  abserr,  b,  epsabs,  epsrel,  omega, result;
        int key = 0;
        double[] w = new double[lw];
        int subintvls;
        int ifail;
        Console.WriteLine("d01an Example Program Results");
        epsrel = 1.00e-04;
        epsabs = 0.00e+00;
        a = 0.00e0;
        b = 1.00e0;
        omega = 10.00e0 *  Math.PI;
        key = 2;
        kount = 0;
        // 
        D01.d01an(gD01AN, a, b, omega, key, epsabs, epsrel, out result, out abserr, w,
                  out subintvls, out ifail);
        // 
        if (ifail >= 0)
        {
          Console.WriteLine("");
          Console.WriteLine("  {0}{1,10:f4}", "a      - lower limit of integration = ", a);
          Console.WriteLine("  {0}{1,10:f4}", "b      - upper limit of integration = ", b);
          Console.WriteLine("  {0}{1,9:e2}", "epsabs - absolute accuracy requested = ", epsabs);
          Console.WriteLine("  {0}{1,9:e2}", "epsrel - relative accuracy requested = ", epsrel);
          Console.WriteLine("");
          if (ifail != 0)
          {
            Console.WriteLine("  {0}{1,4}", "ifail = ", ifail);
          }
          if (ifail <= 5)
          {
            Console.WriteLine("  {0}{1,9:f5}", "result - approximation to the integral = ", result);
            Console.WriteLine("  {0}{1,9:e2}", "abserr - estimate of the absolute error = ", abserr);
            Console.WriteLine("  {0}{1,4}", "kount  - number of function evaluations = ", kount);
            Console.WriteLine("  {0}{1,4}", "subintvls   - number of subintervals used = ", subintvls);
          }
        }
        else
        {
          Console.WriteLine("");
          Console.WriteLine("** d01an failed with ifail = {0,5}", ifail);
        }
        // 
      }
      catch (Exception e)
      {
        Console.WriteLine(e.Message);
        Console.WriteLine("Exception Raised");
      }
      ;
    }
    // 
    public static double g(double x)
    {
      double gValue = 0.0;
      kount = kount + 1;
      gValue = 0.00e0;
      if (x > 0.00e0)
      {
        gValue = Math.Log(x);
      }
      return gValue;
    }
  }
}