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iOS Swift 2.0 Collections and Control Flow Control Flow With Conditional Statements Working with Logical Operators

Posted by Denali Lord
Denali Lord
Courses Plus Student 1,955 Points

This is a tough one...

So I have created my if loop and used the && operator as the question asks, " for the odd numbers and the multiples of 7. Not really sure where to go from here...

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

for n in 1...100 {
    // Enter your code below
    if results {
    (!2 % 0) && (n * 7)
    // End code 
}

2 Answers

Jennifer Nordell
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STAFF
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Jennifer Nordell
Treehouse Teacher
Jennifer Nordell
.a{fill-rule:evenodd;}techdegree
Jennifer Nordell
Treehouse Teacher

First, we're not going to evaluate anything in results. Results is empty and they want us to fill it up. Secondly, never divide by 0. It's just a no no, because well... it can't be done :) Here's what we want the code to do. We want it to start at 1 and ask is 1 an odd number? Yes! Is it evenly divisible by 7? No!. Ok skip that one. Then we do the same thing and check 2. Which has a result of No on both questions. But when we get to 7 things get more interesting. Is 7 odd? Yes! Is it evenly divisible by 7? Yes! Ok add it to our results array. And here's how we do it:

var results: [Int] = []

for n in 1...100 {
    // Enter your code below
    if(n % 7 == 0 && n % 2 != 0) {
      results.append(n)
    }
    // End code 
}

Any number % 2 will either return a 0 or a 1. If it returns a 1 it's odd. If it returns a 0 it's even. Hope this helps!

Martin Wilter
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Martin Wilter
iOS Development Techdegree Student 8,782 Points
Martin Wilter
.a{fill-rule:evenodd;}techdegree
Martin Wilter
iOS Development Techdegree Student 8,782 Points

Hi Denali,

There are a few syntax issues with your code that might prevent you from progressing properly, so below I have provided some pseudo code to help you out. Replace the comment markers and anything between them with your own code:

for n in 1...100 {
    // Enter your code below
    if /* the number n is odd */ && /* the number n is a multiple of 7 */ {
    /* append the numner n to the array var results */
    }
    // End code
}