Welcome to the Treehouse Community

Want to collaborate on code errors? Have bugs you need feedback on? Looking for an extra set of eyes on your latest project? Get support with fellow developers, designers, and programmers of all backgrounds and skill levels here with the Treehouse Community! While you're at it, check out some resources Treehouse students have shared here.

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and join thousands of Treehouse students and alumni in the community today.

Start your free trial

iOS

Posted by Cesar Gonzalez
Cesar Gonzalez
614 Points

Having trouble with the Not Operator in Swift Basics last challenge, please help! https://teamtreehouse.com/library/swif

Help , Thanks . Question asks to ((((Declare a constant named isWinner and assign the results of a comparison operation to check whether the player has won or not. If the total score is not 10, then the player has won, otherwise he or she has lost. (Hint: Use the NOT operator))))

var initialScore = 8 let totalScore = ++initialScore ///question let winTen = !true let otherNumber = true let isWinner = true

Jake Adams
Jake Adams
1,608 Points

Can you provide a link to the challenge so I can take a look?

3 Answers

Unsubscribed User
Unsubscribed User
24,880 Points

You'd have to declare a constant named isWinner first, so:

let isWinner =

and then it's telling you that if totalScore DOES NOT EQUAL 10, then isWinner is true. The question is looking to get a boolean value for the constant isWinner, so it should evaluate to true because totalScore is holding the value 9. 

let isWinner = totalScore != 10

Essentially it means: 9 != 10 and this is true

Cesar Gonzalez
Cesar Gonzalez
614 Points

Thanks man it help me a lot to understand the task i didnt know i could write a piece of code like that anyways thanks bro!!

Cesar Gonzalez
Cesar Gonzalez
614 Points
Cesar Gonzalez
Cesar Gonzalez
614 Points

https://teamtreehouse.com/library/swift-20-basics/swift-operators/working-with-operators-part-2

thanks man

Jake Adams
Jake Adams
1,608 Points
Jake Adams
Jake Adams
1,608 Points

Ok, using hardcoded values like setting the initialScore to 8 can cause confusion in a scenario like this. Our goal is to come up with code that will behave as we expect even when we don't know the initialScore. So for our purposes, let's pretend we don't know the value.

You have the increment correct, so the only thing we know about totalScore is that it is at least 1. We also know that the losing score is 10. To make this easier to read, I would recommend setting a constant 

let losingScore = 10

What we want to do now is compare the totalScore to the losingScore. If they are not equal, then isWinner should be true. The goal of this task, though, is to not use the keywords true and false directly. What we're looking for is an expression that will result in either a true or false value.

Tip: == is the equality operator that is checking to see if 2 values are equal. To check if 2 values are not equal, you need to use the not equal operator: !=

let isWinner = <compare totalScore to losingScore here>

Hope this helps!

Cesar Gonzalez
Cesar Gonzalez
614 Points

Thank you bro it did helped me!!