NOT operator

Question

In my challenge, I am designing a game where if the score is exactly 10 you lose, if it is anything but 10 you win. I am required to declare a constant named isWinner and add the results of my comparison operation to that constant. I am to use the NOT operator, yet when I use it with integers it says i am making an error. How do i tackle this challenge without using the NOT operator on the number 10?
```operators2.swift
// Enter your code below
var initialScore = 8
let totalScore = ++initialScore
let isWinner = !10
```

Tobias Helmrich · Accepted Answer

Hey Joey,
you have to use the not operator on a boolean value but you're using it on a number. Besides that you're not comparing the totalScore of the player to anything so you can't really check if the player has won or lost.
One way to solve this task would be like that:
```swift
// Enter your code below
var initialScore = 8
let totalScore = ++initialScore
let isWinner = !(totalScore == 10)
```
In this case we're comparing the value of totalScore to 10. If the totalScore constant has the value of 10 it will evaluate to true and because the player loses if he has a score of 10 we now have to turn this to false using the not operator.
I hope that helps, good luck! :)

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Joey Shiner

Joey Shiner

NOT operator

1 Answer

Tobias Helmrich

Tobias Helmrich