title: Cassinis Identity
signature: cassinisIdentity :: Integer -> Integer
  cassinisIdentity n = 
test_code: import Text.Printf
  import Control.Exception (catch, SomeException)
  import Data.Typeable
  import qualified Data.List as List
  import qualified Data.Map as Map
  import qualified Data.Set as Set
  
  -- SOLUTION CODE
  -- ============================================
  
  PLACEHOLDER_CODE_BODY
  
  -- TESTING CODE 
  -- ============================================
  validateSolution :: Integer -> Integer -> Bool
  validateSolution actual expected = do
      actual == expected
  
  
  driver :: Integer -> Integer -> String
  driver n expected = do
      if (validateSolution (PLACEHOLDER_FN_NAME n) expected)
          then "PASSED"
      else "FAILED"
  
  main = do
      printf "TEST-0...%s\n" (driver (67) (-1) )
  
      printf "TEST-1...%s\n" (driver (2) (1) )
  
      printf "TEST-2...%s\n" (driver (58) (1) )
  
      printf "TEST-3...%s\n" (driver (6) (1) )
  
      printf "TEST-4...%s\n" (driver (42) (1) )
  
      printf "TEST-5...%s\n" (driver (17) (-1) )
  
      printf "TEST-6...%s\n" (driver (37) (-1) )
  
      printf "TEST-7...%s\n" (driver (44) (1) )
  
      printf "TEST-8...%s\n" (driver (23) (-1) )
  
      printf "TEST-9...%s\n" (driver (40) (1) )
  
source_py: def cassinis_identity(n):
      return ((- 1) if (n & 1) else 1)
source_cpp: int cassinis_identity(int n) {
    return ( n & 1 ) ? - 1 : 1;
  }