import java.util.Scanner;

/*******************************************************************************/
/** A program to compute integrals
 *
 *  Original version by Duncan Buell for CSCE 145, Spring 2008
 *  Local modifications by XXXXX XXXXXXX
 *
*/
public class Main
{
  public static void main (String[] args)
  {
    final int INCSEGMENTS = 10;
    final int MINSEGMENTS = 10;
//    final int MAXSEGMENTS = 100000000;
//    final int MAXSEGMENTS = 1000;
    final int MAXSEGMENTS = 10;

    double leftEnd,rightEnd,integral;
    Scanner console = new Scanner(System.in);
    ComputeIntegral theIntegral = new ComputeIntegral();

/*******************************************************************************/
/**
 * First we get the left and right endpoints and check that they are valid
**/
    System.out.printf("Left Endpoint?%n");
    leftEnd = console.nextDouble();
    System.out.printf("Left Endpoint is %f%n",leftEnd);

    System.out.printf("Right Endpoint?%n");
    rightEnd = console.nextDouble();
    System.out.printf("Right Endpoint is %f%n",rightEnd);

    if(leftEnd > rightEnd)
    {
      System.out.printf("ERROR:  left endpoint not lessequal right endpoint%n");
      System.exit(1);
    }

/*******************************************************************************/
/**
 * Compute the area by using trapezoids
**/
    System.out.printf("%nCompute the integral using trapezoids%n");
    integral = 0.0;
    for(int n = MINSEGMENTS; n <= MAXSEGMENTS; n = INCSEGMENTS*n)
    {
      System.out.println("Create the data");
      theIntegral.createData(leftEnd,rightEnd,n);

      System.out.println("Echo the data");
      theIntegral.echoData();

      System.out.println("Compute the integral");
      integral = theIntegral.doIntegralTrapezoids();
      System.out.printf("The integral using %13d panel segments is approximately %12.6f%n",
                         n,integral);
    }
    System.out.printf("The integral using trapezoids is approximately %12.6f%n",integral);

/*******************************************************************************/
/**
 * We're done
**/
    System.out.printf("Program terminating normally%n");
  }
} // public class Main