Swift 2 var str = "Hello, playground" let str1 = "swift" let str2 = "1 + 2 = \(1+2)" var str3 = "Hello" str3 = str3 + "Swift" str3.append("!") let intVal = 123 let strFromInt = String(intVal) let intStr = "1234" let intValFromSrt = Int(intStr) let num = Int("123a") ----------------------- let srt = "Hello Swift" str.characters.count str.startIndex str.endIndex let index3 = str.index(str.startIndex, offs.. 더보기 이전 1 다음