21. Arithmetic Operators, cont.

• 
  // double arithmetic
  double a = 8.5;
  double b = 3.4;
  double result5 = a + b;       // result5 = 11.9
  double result6 = a - b;       // result6 = 5.1
  double result7 = a * b;       // result7 = 28.9
  double result8 = a / b;       // result8 = 2.5