按照書本寫了以下代碼，但貌似因為所用swift版本（我的環境是Xcode7.3）不同導致了一點語法錯誤，沒有想到頭緒……let simpleInterestCalculationClosure = { (loadAmmon : Double, var interestRate : Double, years : Int) -> Double in
//警告1:'var' parameters are deprecated and will be remove in swift 3 fix-it Delete "var"
interestRate = interestRate / 100.0
//錯誤2: Cannot assign to value: 'interestRate' is a 'let' constant
var interest = Double(years) * interestRate * loadAmmon
return loadAmmon + interest
}但是刪除了var之后會出現錯誤2
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