Round a double/float in Swift (2 digits)

Question

I'm really confused because I'm trying to round a number in Swift and if I run my code on playground I have my number rounded perfectly but if I use "parameters" to send it in Alamofire I don't have my number rounded... Any idea with this issue?. These are my attempts to round my number :(

ATTEMPT 1

        var orderTotal = 0.0
        
        orderTotal = Double(total * 100).rounded()/100

   let parameters: [String: Any?] = [
            "Total": orderTotal
    ]

ATTEMPT 2

 let parameters: [String: Any?] = [
            "Total": total.rounded(digits: 2)
    ]

extension Double {
    func rounded(digits: Int) -> Double {
        let multiplier = pow(10.0, Double(digits))
        return (self * multiplier).rounded() / multiplier
    }
}

ATTEMPT 3

 let parameters: [String: Any?] = [
            "Total": Float(String(format:"%.2f", (total)))
    ]

 

PS. "total" is a Float parameter with 6-8 decimals

Answer 1

Doubles and floats are binary floating-point. They do not round to decimal values; they round to binary values. If you want a decimal value, use a Decimal.