Swift教程之運算子

標籤：swift   運算子   oc   

import Foundation//4、複合賦值操作符var a = 1a += 2//一元減運算子（一個數值前加了符號-，叫作一元減運算子）let three = 3let minusThree = -three //minusThree = -3let plusThree = -minusThree // plusThree = 3//一元加運算子（一元加運算子(+)返回的值，不做任何變動）let minusSix = 6let alsoMinusSix = +minusSix // alsoMinusSix = 6//6、三元條件運算子//特別注意：三目運算子裡面的(?)前面一定要有至少一個空格let contentHeight = 40let rowHeight = contentHeight + (contentHeight > 20 ? 50 : 20)//7、範圍運算子//封閉範圍運算子（包括a和b）for index in 1...5 {    print("\(index) times 5 is \(index * 5)")}//半封閉的地區運算子（包頭不包尾）let names = ["Anna", "Alex", "Brian", "Jack"]let count = names.countfor i in 0..<count{    print("Person \(i) is called \(names[i])")}

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Swift教程之運算子