Nim cases

case.nim

case 'h':
  of 'a', 'e', 'i', 'o', 'u':
    echo "Vowel"
  of '\127'..'\255':
    echo "Unknown"
  else:
    echo "Consonant"

proc positiveOrNegative(num: int): string = 
  result = case num:
    of low(int).. -1: # remember space between
      "negative"
    else:
      "impossible"

echo positiveOrNegative(-1)

echo low(int)