// This class represents a piece of stock that a person might own

public class Stock
{
	private String symbol, name;		// symbol is the Stock Market abbreviation, name is the name of the company
	private double previousClosingPrice, currentPrice;	// the worth of 1 share of stock from the last market close and today's market close
	
	public Stock(String s, String n)		// constructor which initializes Stock's worth to 0
	{
		symbol=s;
		name=n;
		currentPrice=previousClosingPrice=0.0;
	}
	
	public void newCurrentPrice(double newValue)	// If legal new value, move current Stock's worth to previousClosingPrice, and assign new worth to currentPrice
	{
		if(newValue>=0) {
			previousClosingPrice=currentPrice;
			currentPrice=newValue;
		}
		else System.out.println("Erroneous value " + newValue);
	}
	
	public void setPreviousClosingPrice(double value)	// if new value is legal, reset previousClosingPrice to new 
	{
		if(value>=0) previousClosingPrice=value;
		else System.out.println("Erroneous value " + value);
	}	

	public void setCurrentPrice(double value)	// if new value is legal, reset currentPrice to new 
	{
		if(value>=0) currentPrice=value;
		else System.out.println("Erroneous value " + value);
	}	
	
	public double getChangePercent()			// compute the percentage change from previousClosingPrice to currentPrice and return as a double
	{
		return (previousClosingPrice - currentPrice)/currentPrice;
	}
}