Question

La nguage is SML/NJ

Explain the mistake(s) that make this code fail to compute the smallest value in an int list:

fun min(ints) = if null(tl ints) then (hd ints) else min(tl ints);

Answer 1

In your code you have declared that min(tl ints) .

Its not a correct statement while hd ints is declared first.

That's why the code fail to work.

Use this code to compute the smallest value in int list

fun smallest [] = NONE

  | smallest (x::xs) = case smallest xs of
                       NONE => SOME x
                     | SOME y => if x < y
                                 then SOME x
                                 else SOME y