Compound cases

Cases can be combined on one line, if they are required to share the same block of code:

let a = 1 

switch a 
{ 
case 1,3,5,7,9: 
  print("a is a single digit positive odd number") 
case 0, 2,4,6,8: 
  print("a is a single digit positive even number") 
default: 
  print("a is not a single digit positive number") 
}