// Method to calculate the action. No potential coded yet
import java.util.Scanner;
import java.io.*;

//class variables -Ximinus Xi, Xiplus, mass, action.
public class Action {

    private int Ximinus = 0;
    private int Xi = 0;
    private int Xiplus = 0;
    private double Mass = 1;
    private double A = 1;

    // setters and getters

    //setters
    public void setXiminus(int ximinus){
	Ximinus = ximinus ;}
    public void setXi(int xi){
	Xi = xi ;}
    public void setXiplus(int xiplus){
	Xiplus = xiplus ;}
    public void setMass(double mass){
	Mass = mass;}
    public void setA(double a){
	A = a;}

    //getters - not sure if want
    public double getXi(){
	return Xi;}
    public double getXiplus(){
	return Xiplus;}
    public  double getMass(){
	return Mass;}


    //calculate action of the class variables
    int difference1 = Xi - Ximinus;
    int difference2 = Xiplus - Xi;

    double S1 = Mass*Math.pow(difference1,2)/(A*2);
    double S2 = Mass*Math.pow(difference2,2)/(A*2);

    double FinalS = S1 + S2;

    //getAction Method

    public double getAction( int X1, int X2, int X3, double m, double A1) {
	setXiminus(X1);
	setXi(X2);
	setXiplus(X3);
	setMass(m);
	setA(A1);

	return FinalS;

    }


}