Xcode gives error for everything I write - swift

Question

I have been searching for a solution for two days but could not find anything on web.
I was working on a project and then instantly I was not able to declare anything new or iterate anything older that I wrote. I tried opening new project and start again but it was there again. You can see in the photo that it does need declaration for already declared variables such as cool and hype.
Now I am not able to work on any project.
import UIKit
class ViewController: UIViewController, CLLocationManagerDelegate {
var cool: Int = 2
var hype: Int = 2
hype = 2 + cool
override func viewDidLoad() {
super.viewDidLoad()
// Set up the location manager here.
locationManager.delegate = self
locationManager.desiredAccuracy = kCLLocationAccuracyHundredMeters
locationManager.requestWhenInUseAuthorization()
locationManager.startUpdatingLocation()
}
// ...
}

Answer 1

Use of undeclared type 'CLLocationManageDelegate'
This is because you haven't imported the CoreLocation module
Add the line import CoreLocation above the import UIKit
You can't perform the assignment of hype in that scope, try moving it into viewDidLoad
You must declare a location manager variable and initialize one:
Add the line var locationManager = CLLocationManager() above your other vars.
import CoreLocation
import UIKit
class ViewController: UIViewController, CLLocationManagerDelegate {
let locationManager = CLLocationManager()
var cool: Int = 2
var hype: Int = 2
override func viewDidLoad() {
super.viewDidLoad()
hype = 2 + cool
// Set up the location manager here.
locationManager.delegate = self
locationManager.desiredAccuracy = kCLLocationAccuracyHundredMeters
locationManager.requestWhenInUseAuthorization()
locationManager.startUpdatingLocation()
}
// ...
}

Answer 2

Actually, all your errors are totally generic, caused by syntax and other mistakes.
It should be CLLocationManager needs to be imported.
This produces errors in declaration and other places depending on it.
Variables can be declared but not manipulated outside a function on the top level of a class.
The variable locationManager has not been defined previously