uint32

问题 I have this expression which returns a UInt32 : let randomLetterNumber = arc4random()%26 I want to be able to use the number in this if statement: if letters.count > randomLetterNumber{ var randomLetter = letters[randomLetterNumber] } This issue is that the console is giving me this Playground execution failed: error: <REPL>:11:18: error: could not find an overload for '>' that accepts the supplied arguments if letters.count > randomLetterNumber{ ~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~ The problem

问题 When should one use the datatypes from stdint.h? Is it right to always use as a convention them? What was the purpose of the design of nonspecific size types like int and short? 回答1: When should one use the datatypes from stdint.h? When the programming tasks specify the integer width especially to accommodate some file or communication protocol format. When high degree of portability between platforms is required over performance . Is it right to always use as a convention them (then)? Things