public class Pitcher {
    public static final int INNINGS_PER_GAME = 9;
   
    private double inningsPitched;
    private int runsScored;
    private int wins;
    private int losses;

    public Pitcher() {
        // Empty constructor, doesn't do anything.
    }

    public Pitcher(double inningsPitched, int runsScored, int wins, int losses) {
        this.inningsPitched = inningsPitched;
        this.runsScored = runsScored; 
        this.wins = wins; 
        this.losses = losses;
    }

    public Pitcher(double inningsPitched, int runsScored) {
       this.inningsPitched = inningsPitched;
       this.runsScored = runsScored;
    }
    
    public double ERA() {
        if (this.inningsPitched > 0) {
            return this.runsScored / this.inningsPitched * INNINGS_PER_GAME;
        }

        return 0.0;
    }

    // Accessor methods
    public double inningsPitched() {
        return this.inningsPitched;
    }

    public int runsScored() {
        return this.runsScored;
    }

    public int wins() {
        return this.wins;
    }

    public int losses() {
        return this.losses;
    }
    
    // Mutator method
    public void incrementWins() {
        this.wins++;
    }
}