// Fig. 7.20: VarargsTest.java
// Using variable-length argument lists.

public class VarargsTest 
{
   // calculate average
   public static double average( double... numbers )
   {
      double total = 0.0; // initialize total

      // calculate total using the enhanced for statement
      for ( double d : numbers )
         total += d;

      return total / numbers.length;
   } // end method average

   public static void main( String[] args ) 
   {
      double d1 = 10.0;
      double d2 = 20.0;
      double d3 = 30.0;
      double d4 = 40.0;

      System.out.printf( "d1 = %.1f\nd2 = %.1f\nd3 = %.1f\nd4 = %.1f\n\n",
         d1, d2, d3, d4 );

      System.out.printf( "Average of d1 and d2 is %.1f\n", 
         average( d1, d2 ) ); 
      System.out.printf( "Average of d1, d2 and d3 is %.1f\n", 
         average( d1, d2, d3 ) );
      System.out.printf( "Average of d1, d2, d3 and d4 is %.1f\n", 
         average( d1, d2, d3, d4 ) );
   } // end main
} // end class VarargsTest


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