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.




 
n = 1234567
middle(n)
 
func middle nr
     mnr = floor(len(string(nr))/2)
     lennr = len(string(nr))
     if lennr = 3 see "" + nr + nl
     but lennr < 3 see "Number must have at least three digits"
     but lennr%2=0 see "Number must have an odd number of digits"
     else cnr = substr(string(nr),mnr,3) see cnr + nl ok 
 