// for-in 遍歷Stringfor c in str.characters{  print(c)}//c是Character類型

// Character和String的相互轉換//let mark = "!" //此時mark是String類型let mark: Character = "!" //Character必須要顯示聲明//str + mark //類型不同拼接會報錯str + String(mark) //進行類型轉換后再拼接// append 相當于 +=str.append(mark)//var類型才可以調用append方法，let類型不可以

// Characters是基于Unicode的let englishLetter: Character = "a"let chineseLetter: Character = "哈"let dog: Character = "��"let coolGuy = "/u{1F60E}"

// String對Unicode的支持var coolLetters = "abc" //abccoolLetters.characters.count //3var chineseLetters = "你好嗎" //你好嗎chineseLetters.characters.count //3var coolGuys = "/u{1F60E}/u{1F60E}/u{1F60E}" //������coolGuys.characters.count //3

var cafe = "café" //cafévar cafe2 = "cafe/u{0301}" //cafécafe.characters.count //4cafe2.characters.count //4// String的比較cafe == cafe2