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Sachin
Sachin

Reputation: 765

Error when trying to convert string to a double

I am trying to convert a String into a Double value in Swift. After doing a lot of research, I believe that this would be the best method to turn my string to an Double. But now I am getting an error that I have no idea of how to fix.

var purchaseAmount: Double = 200

var cashTendered: Double = 425.45

var changeRequired: Double = 0

var currencyValues = ["100", "50", "20", "10", "5", "2", "1", "0.50", "0.20", "0.10", "0.05"]

import Cocoa

if cashTendered < purchaseAmount {
    println("Not enough cash tendered")
} else {
    changeRequired = cashTendered - purchaseAmount
    for currency in currencyValues {
        var doubleCurrency = (currency as NSString).doubleValue
        var amountOfCurrency = changeRequired / doubleCurrency
        amountOfCurrency = floor(amountOfCurrency)
        changeRequired = changeRequired - (amountOfCurrency * currency)
        changeRequired = round(changeRequired * 100)/100
        println("$\(currency) X \(Int(amountOfCurrency))")
    }
}

Here is the error: enter image description here

What do I have to do to solve this problem?

Upvotes: 0

Views: 178

Answers (2)

Mehul Patel
Mehul Patel

Reputation: 23053

First of all initialise String array like below:

let currencyValues : [String] = ["100", "50", "20", "10", "5", "2", "1", "0.50", "0.20", "0.10", "0.05"]

However it is not required type declaration because of Swift has vital feature Type Interface. But most of the practice it is good to define type while working with array.

And about converting string to double you can use below code:

for currency : String in currencyValues {
   let doubleCurrency = NSNumberFormatter().numberFromString(currency)!.doubleValue
   print(doubleCurrency)
}

Upvotes: 2

Jeremy Pope
Jeremy Pope

Reputation: 3352

Posting code would be easier to look at than an image, but if all else fails there is NSNumberFormatter. Other advantage of NSNumberFormatter would allow you to convert both directions and get nice output for things like currency.

Upvotes: 0

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