// This class represents a stock to trade on the market consisting of a name, a symbol, the current price per share
// and the previous day's closing price per share.  There is a no-arg constructor, a 2-arg constructor which gets
// the name and symbol only (both constructors initialize the prices to 0) and a 3-arg constructor (which initializes
// the previousClosingPrice to 0).  There are accessors and mutators, a toString and a method to compute the
// percent change between the last day's closing and the current price.  Note that there is no mutator for
// the previousClosingPrice, that is automatically set with the currentPrice whenever the day ends using the 
// endOfDay method.

public class Stock
{
	private String name, symbol;							// Strings describing the name and abbreviation (symbol) of the stock
	private double previousClosingPrice, currentPrice;		// yesterday's cost per share and the current cost per share
	
	public Stock()											// no-arg constructor, no info, do the best we can to initialize a new stock
	{
		name = "unknown";
		symbol = "xxx";
		previousClosingPrice = currentPrice = 0.0;
	}
	
	public Stock(String n, String s)						// new stock with no known costs
	{
		name = n;
		symbol = s;
		previousClosingPrice = currentPrice = 0.0;
	}
	
	public Stock(String n, String s, double p)				// typical constructor for a new stock (no previous cost since its brand new)
	{
		name = n;
		symbol = s;
		previousClosingPrice = 0.0;
		currentPrice = p;
	}
	
	public void setName(String n)							// mutators for name and symbol, currentPrice and previousClosingPrice will only change via endOfDay method
	{
		name = n;
	}
	
	public void setSymbol(String s)
	{
		symbol = s;
	}
	
	public String getName() {								// accessors
		return name;
	} 
		
	public String getSymbol() {
		return symbol;
	}
	
	public double getPrice() {
		return currentPrice;
	}
	
	public double getPreviousClosingPrice() {
		return previousClosingPrice;
	}
	
	public String toString()								// toString to describe this stock (does not provide previousClosingPrice value)
	{
		return name + "\t" + symbol + "\t" + currentPrice;
	}
	
	public void endOfDay(double p)							// at the end of each day, set the new value for currentPrice while assigning previousClosingPrice what today's currentPrice was
	{
		previousClosingPrice = currentPrice;			
		currentPrice = p;									// note:  we should ensure p > 0 before doing this 
	}
	
	public double getChangePercent()
	{
		return (currentPrice - previousClosingPrice)/currentPrice;
	}

}