Welcome to the Treehouse Community

The Treehouse Community is a meeting place for developers, designers, and programmers of all backgrounds and skill levels to get support. Collaborate here on code errors or bugs that you need feedback on, or asking for an extra set of eyes on your latest project. Join thousands of Treehouse students and alumni in the community today. (Note: Only Treehouse students can comment or ask questions, but non-students are welcome to browse our conversations.)

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and a supportive community. Start your free trial today.

iOS Swift Collections and Control Flow Control Flow With Conditional Statements Working With Logical Operators

I have no clue how to do this question

how do you input even of odds in code? or tell if you can divide by 7

operators.swift
var results: [Int] = []

for n in 1...100 {
    // Enter your code below
    if in !
    // End code 
}

2 Answers

You will want to use the modulo operator %. If a number is perfectly divisible by another a modulo operation returns zero. For example:

n % 7

equals zero if n is perfectly divisible by 7

n % 2

equals zero if n is perfectly divisible by 2 (and therefore even)

So for this challenge you will want to check if n % 7 == 0 and n % 2 != 0 to see if the number is both perfectly divisible by 7 and odd (not even).

You can use the AND operator (&&) to specify both conditions need to be true in order for the loop to run.

var results: [Int] = []

for n in 1...100 {


    if n % 7 == 0 && n % 2 != 0 {

        results.append(n)
    }

}