/** 
 * Demonstration class for CSE 142 lecture on testing and debugging.
 *  2/03
 */
public class CreditCard {
  // instance variables
  public String name;            // account name
  public int    number;          // account number
  public double limit;           // account limit, must be >= 0.00
  public double balance;         // account balance, must have
                                 //    0.0 <= balance <= limit
  
  /**
   *  Charge amount to this CreditCard if amount+balance <= limit.
   *  If successful, return true; if not, change nothing and return false
   */
  public boolean charge(double amount) {
 //   System.out.println("charge method entered");
    if (amount + balance <= limit) {
 //     System.out.println("In amount + balance <= limit condition in charge method");
      balance = balance + amount;
      return true;
    } else {
      return false;
    }
  }
  
  /**
   * Return the current balance of this CreditCard
   */
  public double getBalance() {
 //   System.out.println("getBalance entered; balance = " + balance);
    return balance;
  }
  
  /**
   * return a String representation of this CreditCard
   */
  public String toString() {
    String result = "CreditCard[name = " + name
      + ", number = " + number + ", limit = " + limit
      + ", balance = " + balance + "]";
    return result;
  }
  
  /** 
   *  Construct new CreditCard with given name, number, and limit, and
   *  with a balance of 0.0
   */
  public CreditCard(String name, int number, double limit) {
//    System.out.println("CreditCard constructor entered");  
    this.name    = name;
    this.number  = number;
    this.limit   = limit;
    this.balance = 0.0;
  }
}