Task

Write a function/procedure/subroutine that is called with an integer value and returns the middle three digits of the integer if possible or a clear indication of an error if this is not possible.

Note: The order of the middle digits should be preserved.

Your function should be tested with the following values; the first line should return valid answers, those of the second line should return clear indications of an error:

123, 12345, 1234567, 987654321, 10001, -10001, -123, -100, 100, -12345
1, 2, -1, -10, 2002, -2002, 0

Show your output on this page.




var valid = {123, 12345, 1234567, 987654321, 10001, -10001, -123, -100, 100, -12345}
valid.each(\ num ->print(middleThree(num)))
 
var errant = {1, 2, -1, -10, 2002, -2002, 0}
errant.each(\ num ->print(middleThree(num)))
 
function middleThree(x: int) : String {
  var s = Math.abs(x) as String
  if(s.length < 3) return "Error: ${x} has less than 3 digits"
  if(s.length % 2 == 0) return "Error: ${x} has an even number of digits"
  var start = (s.length / 2) - 1
  return s.substring(start, start + 3)
}