Swift－字符串操作以及运算

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字符串操作以及循环

/* 1、字符*/var c:Characterc = "张"//在swift中字符可以是单个中文,OC中只能是单个英文var cc:String = "aab张三"print("1、字符\n\(cc.characters.count)")/* 2、字符串构造 */let str1 = "\n2、字符串构造\nhello,"let str2 = "world"let str3 = str1 + str2print(str3)var urlStr = "http://www.baidu."var urlString = "\(urlStr)com"print(urlString)/* 3、字符串比较 */print("\n3、字符串比较")let str31 = "hello"if str31 >= "aello"{    print(str31)}let str32 = "Apple"if str32.hasPrefix("a"){    print(str32)}print(str32.uppercased())//全部大写print(str32.lowercased())//全部小写/* 4、数学运算 */print("\n4、数学运算")//let a:UInt8 = 255 + 1//overflow 溢出let a:UInt8 = 255let b:UInt8 = 10//let ab = a+b //运行时报错（溢出）//print(9 % 2.5)/* 5、区间运算 闭区间：（a...b）  1...3 -> 1,2,3 半闭区间：（a..<b) 1..<3 -> 1,2 */print("\n5、区间运算")for i in 1..<3{    print(i)}

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