2

public class Runge5 extends Runge2 {

	public static double f(double x, double y) {
	double f = 1000*x;
	return f;
	}


	public static void main(String[] args) {




		try{

		double stepSize = Double.parseDouble(args[0]);


		/* this sets the range of the integral */

		double initial = 0;
	      	double end = 1;

		/* steps is total steps and finalY is the value of the integral */

	        double steps = (end - initial) / stepSize;
		double i = 0;
		double finalY = 0;

		if (stepSize <= 0)
		    throw new Exception("Error: Stepsize is negative or 0. \n");

		for (i = 0; i < steps ; i++){
		    finalY += rk(initial + i * stepSize,
				 0, stepSize);
		}

		System.out.printf("The Runge Kutta method gives the value \n" );
		System.out.printf("%1.4f as the integral of x^5 * e^x^3  \n",
				  finalY);
		System.out.printf("on the interval of %1.4f to %1.4f  \n",
				  initial, end );
		System.out.printf("using %1.0f steps and a step size of %1.6f \n",
				  steps,stepSize);

	        if (stepSize > 1.0)
		    throw new Exception("Warning: Stepsize is large. Values may be off.\n");
		}

		catch(Exception e){
	    	    System.out.printf(e.getMessage());
	    	    System.out.printf("\nYou need to input a float point value \n");
		    System.out.printf("For the value of the step size. To get a \n");
		    System.out.printf("reasonable answer, this step size should \n");
		    System.out.printf("be fairly small, non-negative and entered \n");
		    System.out.printf("FUCKas a command line argument, thank you. \n");

	    	}


	    }




	}