CODEWITHSUNDEEP
haskell
Diana
Diana

Reputation: 1437

Haskell - too few arguments

I want to write a Haskell program that calculates the sum of numbers between 2 given numbers. I have the following code:

sumInt :: Int -> Int -> Int
sumInt x y
   | x > y = 0
   | otherwise = x + sumInt x+1 y

But when I compile it I get the following error:

SumInt is applied to too few arguments.

I don't understand what I'm doing wrong. Any ideas?

Upvotes: 6

Views: 6627

Answers (1)

bheklilr
bheklilr

Reputation: 54058

You need parentheses around x+1:

| otherwise = x + sumInt (x + 1) y

The reason is that function application binds more tightly than operators, so whenever you see

f x <> y

This is always parsed as

(f x) <> y

and never as

f (x <> y)

Upvotes: 7

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