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iOS

Swift - Binary operator ... cannot be used with float? I am just experimenting with the lesson files. Can you explain?

Can some provide insight on why I can not use operator ...

struct locations {  
    let lat: Float
    let long: Float
    func getLocationRange (distance dist: Float) -> [locations] {

        var results: [locations] = []
        let latMinusDistance = lat - dist
        let latPlusDistance = lat + dist
        let longMinusDistance = long - dist
        let longPlusDistance = long + dist

        for latCoord in (latMinusDistance)...(latPlusDistance)  {
            for longCoord in (longMinusDistance)...(longPlusDistance) {
                let mainCood = locations(lat: latCoord, long: longCoord)
                results.append(mainCood)
            }
        }
    return results
    }
}
let locationMain = locations(lat: 43.0, long: 37.0)
let distance =  locationMain.getLocationRange(distance: 0.1)