Use Haskell finish this code! Write a Haskell function combine :: Int -> Int ->

Question

Use Haskell finish this code!

Write a Haskell function combine :: Int -> Int -> Int -> Int

with the following behavior:

• When x, y, and z all correspond to digit values (i.e., integers between 0 and 9, inclusive), combine x y z returns the integer given by the sequence of digits x y z. (That is, x is treated as the digit in the hundreds place, y is treated as the digit in the tens place, and z is treated as the digit in the ones place.)

• In all other cases, the function returns -1.

For example, combine 4 2 8 returns 428, combine 0 3 0 returns 30 (because 030 = 30), and combine 4 12 3 returns -1.

The function should look like this

combine :: Int -> Int -> Int -> Int

combine x y z

| ##########

| ##########

| ##########

Explanation / Answer

| otherwise = -1

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