Tuple matching

If we are dealing with tuples in a switch statement, we can test against them too:

let b = 0 
let c = 1 
let t = (b, c) 

switch t { 
case (0,0): 
  print("cannot divide by a or b") 
case (0,_): 
    print("cannot divide by a") 
case (_,0): 
      print("cannot divide by b") 
default: 
  print("can divide by both a and b") 
} 

Note how the underscore denotes a value in which we are not interested, as is the case with for in loops.