// Fig. 11.8: BasePlusCommissionEmployee.cs
// BasePlusCommissionEmployee class that extends CommissionEmployee.
public class BasePlusCommissionEmployee : CommissionEmployee
{
   private decimal baseSalary; // base salary per week

   // six-parameter constructor
   public BasePlusCommissionEmployee( string first, string last,
      string ssn, decimal sales, decimal rate, decimal salary )
      : base( first, last, ssn, sales, rate )
   {
      BaseSalary = salary; // validate base salary via property
   } // end six-parameter BasePlusCommissionEmployee constructor

   // property that gets and sets 
   // base-salaried commission employee's base salary
   public decimal BaseSalary
   {
      get
      {
         return baseSalary;
      } // end get
      set
      {
         baseSalary = ( value >= 0 ) ? value : 0; // validation
      } // end set
   } // end property BaseSalary

   // calculate earnings; override method Earnings in CommissionEmployee
   public override decimal Earnings()
   {
      return BaseSalary + base.Earnings();
   } // end method Earnings

   // return string representation of BasePlusCommissionEmployee object
   public override string ToString()
   {
      return string.Format( "{0} {1}; {2}: {3:C}",
         "base-salaried", base.ToString(), "base salary", BaseSalary );
   } // end method ToString   
} // end class BasePlusCommissionEmployee


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