# FAQ: Arrays - Review

This community-built FAQ covers the “Review” exercise from the lesson “Arrays”.

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what is wrong with my code? Why I am getting 81 instead of 27 for the oddSum? Thanks

var list = [2, 4, 3, 6, 1, 9]

var evenNum: Int = 0
var oddSum: Int = 1

for item in list {

if item % 2 == 0 {

evenNum += item

} else if item % 2 == 1 {

oddSum = item * item

}

}

print(evenNum, oddSum)
print (“Sum of even numbers is (evenNum)”)
print(“Product of odd numbers is (oddSum)”)

I think the error is in oddSum = item * item, it should be oddSum = oddsum * item or more simple oddSum *= item.

2 Likes

I also did it this way and it works.

1 Like

var list = [2, 4, 3, 6, 1, 9]

var sum = 0
var product = 1

for item in list {
item % 2 == 0 ?
sum += item :
product *= item
}

print (“sum of even numbers is (sum)”)
print (“product of odd numbers is (product)”)

it turns out to be an error

EvenOdd.swift:9:15: error: result values in ‘? :’ expression have mismatching types ‘()’ and ‘Int’
sum += item :

but i just can understand what it is. so can anyone help with me please >.>
1 Like

If anyone was wondering why Codecademy used so many emojies in this course, it is because in Swift 5.3 variable names can be anything, even unicode caharcters!

2 Likes

You are getting the error because of the statement
item % 2 == 0 ? sum += item : product *= item

If you change it to
item % 2 == 0 ? (sum += item) : (product *= item)
it will work.

Have a look at

var list = [2, 4, 3, 6, 1, 9]