/**
 * This series class is the prototype class for all series
 */
public class series
{
	protected double param = 0.0; 
	protected int n = 0;
	protected double term = 0.0;
	protected double val = 0.0;
	
	/**
	 * Class constructor for series
	 */
	series(){
		param = 0.0;
		n = 0;
		term = 0.0;
		val = 0.0;
	}
	/**
	 * Class constructor with parameter
	 *
	 * @param x is the parameter defining the series
	 */
	series(double x){
		param = x;
		n = 0;
		term = 0.0;
		val = 0.0;
	}
	
	/**
	 * Initializes the first term of series.
	 */
	public void first(){
		n = 0;
		term = 0.0;
		val = 0.0;
	}
	
	/**
	 * Advances to the next term of series.
	 */
	public void nextTerm(){
		n++;
		term = term + param;
		val = val + term;
	}
	
	/**
	 * Returns the value of the indexed term in series
	 *
	 * @parem m is the index of the term
	 */
	public double valAt(int m){
		first();
		for (int i=0; i<m; i++)
			nextTerm();
		return val;
	}

	/**
	 * Lists the first m terms of series
	 * 
	 * @param m 
	 */
	public void list(int m){
		first();
		for (int i=0; i<m; i++){
			System.out.print(term +", ");
			nextTerm();
		}
		System.out.println(" ");
		System.out.flush();
	}
}