Re: Where is the syntax error

Hi,

>Now Im stuck at this problem : > 
>let rec power a b = if b = 1 then a * 1 else a * power ( b - 1) ;;
>
>Error: This expression has type int -> int
>       but an expression was expected of type int
The error message is telling you that the invocation of power is
missing an argument.  Also, I suggest using meaningful names for

your arguments, and note that multiplying by 1 is just silly.
Here's a better version:
  let rec power base exp = if exp = 1 then base else base * power base (exp - 1)


Note that the function above is neither tail-recursive nor resilient
against bad arguments (try giving it a negative exponent!).  Consider
improving it further as an exercise...

Best regards,
Dario Teixeira