numberFormats.swift

let binNum = 42
let binStr = String(binNum, radix: 2)
print(binStr)

let octNum = 42
let octStr = String(octNum, radix: 8)
print(octStr)

let hexNum = 42
let hexStr = String(hexNum, radix: 16)
print(hexStr)

let b = Int(0b101010)
print(b)

let o = Int(0o52)
print(o)

let h = Int(0x2a)
print(h)