// CSE 143, Summer 2016
public class BirthdayMystery {
  public static void main(String[] args) {
    int yearsOld = 23;
    yearsOld = happyBirthday(yearsOld);   
    System.out.println("I am " + yearsOld + " today!");
  }

  // Celebrates a person's birthday! Increments yearsOld
  // and prints a fun birthday message.
  //
  // Primitives, like int, are "pass by value." The number gets
  // copied into yearsOld, and is now a completely separate
  // variable
  public static int happyBirthday(int yearsOld) {
    yearsOld++;
    System.out.println("Happy " + yearsOld + "th birthday!");
    return yearsOld;
  }
}