number.isInfinite = function
  return abs(self) == 1/0
end function

number.isNaN = function
  return self != self
end function

number.toBoolStr = function
  if self == 0 then return "false"
  return "true"
end function

checkDivByZero = function(a, b)
  c = a / b
  if c.isInfinite or c.isNaN then return true
  return false
end function

print "Division by zero?"
print "  0 / 0 -> " + checkDivByZero( 0, 0).toBoolStr
print "  1 / 0 -> " + checkDivByZero( 1, 0).toBoolStr
print "  1 / 1 -> " + checkDivByZero( 1, 1).toBoolStr
print " -5 / 0 -> " + checkDivByZero(-5, 0).toBoolStr
print " -5 / 2 -> " + checkDivByZero(-5, 2).toBoolStr