string - 无法将类型 'String' 的值转换为预期的参数类型 '(name: String, balance: Double)'

Question

在下面的代码中，我试图找出为什么末尾的两行显示为错误。

var account1 = ("State bank personal, 1011.10")
var account2 = ("State bank business, 24309.63")

func deposit(amount : Double, account : (name : String, balance : Double)) -> (String, Double) {
    let newBalance : Double = account.balance + amount
    return (account.name, newBalance)
}

func withdraw(amount : Double, account : (name : String, balance : Double)) -> (String, Double) {
    let newBalance : Double = account.balance - amount
    return (account.name, newBalance)
}

var mondayTransaction = deposit
var fridayTransaction = withdraw

let mondayBalance = mondayTransaction(300.0, account1)
let fridayBalace = fridayTransaction(1200.0, account2)

Answer 1

前两行没有余额。您将金额包含在名称中。试试这个:

var account1 = ("State bank personal", 1011.10)
var account2 = ("State bank business", 24309.63)