Swift基础---Integers

let minValue = UInt8.min   //0
let maxValue = UInt8.max   //255

let intValue = 42

let pi = 3.14159
let anotherPi = 3 + 0.14159

let decimalInteger = 17        //十进制
let binaryInteger = 0b1001     //二进制
let octalInteger = 0o21        //八进制
let hexadecimalInteger = 0x11  //十六进制

let decimalDouble = 12.1875
let exponentDouble = 1.21875e1   //e--10^
let hexadecimalDouble = 0xC.3p0  //p--2^

let paddedDouble = 000123.456
let oneMillion = 1_000_000
let justOverOneMillion = 1_000_000.000_000_1

let twoThousand: UInt16 = 2_000
let one: UInt8 = 1
let twoThousandAndOne = twoThousand + UInt16(one)

let three = 3
let pointOneFourOneFiveNine = 0.14159
let pi = Double(three) + pointOneFourOneFiveNine

let intergerPi = Int(pi)      // 3