error: type mismatch; found : (Int, Int) => Int required: Int

I'm new to scala and confused why this code is giving me this error.

def div(m: Int, n: Int, i: Int): Int = {
  (m: Int, n: Int) => 
    if ((m - n) <= 0) 
      return i 
    else 
      div((m-n), n, (i开发者_运维知识库+1)) 
}

Help appreciated.

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It looks like you're returning a function rather than an Int like you're declaring.

Is this what you're trying to do:

def div(m: Int, n: Int, i: Int): Int = if ((m - n) <= 0) return i else div((m-n), n, (i+1))

---

(x: A) => y: B means an anonymous function of type A => B, so the expression you have between the braces is a function (Int, Int) => Int, and that's what gets returned.

---

You use a big number of superflous stuff, the return- keyword, parenthesis, and the whole (m: Int, n:Int) => - part.

def div (m: Int, n: Int, count: Int): Int =
  if ((m - n) <= 0) count else div (m - n, n, count + 1)

If you like to use a match, you could do it this way:

def div (m: Int, n: Int, count: Int = 1): Int = (m - n) match {
  case (diff: Int) if (diff <= 0) => count
  case _ => div (m - n, n, count + 1) }

(note the default-argument of count = 1). m,n,i are a little bit too much short-named variables for my taste. Beneath count, nominator, denominator would fit.

However, the implentation returns

(0 to 2).map (x => div (14+x, 5, 1))
res61: scala.collection.immutable.IndexedSeq[Int] = Vector(3, 3, 4)

where I would expect (2, 3, 3) - you're rounding in the opposite direction.

if ((m - n) < 0) i-1 else ...

would fix that - changing the comparator, and returning i-1 (count-1).

However, this is not testet for values including 0 and negative values.