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.




include ..\Utilitys.tlhy
 
( 123 12345 1234567 987654321 10001 -10001 -123 -100 100 -12345 1 2 -1 -10 2002 -2002 0 )
 
len [
        get ( dup " : " ) lprint
        abs tostr len >ps
        tps 3 < ( ["too short" ?]
                  [ tps 2 mod ( [tps 2 / 3 slice ?] ["is even" ?] ) if]
                ) if 
        ps> drop drop
    ] for 
 
" " input
 