import Foundation

let decimalInteger = 20
print("\(decimalInteger)")
    

let binaryInteger = 0b10100 // 20 in binary notation
print("\(binaryInteger)")


let octalInteger = 0o24 // 20 in octal notation
print("\(octalInteger)")


let hexadecimalInteger = 0x14 // 20 in hexadecimal notation
print("\(hexadecimalInteger)")


let three = 3
print("\(three)")


let pointOneFourOneFiveNine = 0.14159
print("\(pointOneFourOneFiveNine)")


let pi = Double(three) + pointOneFourOneFiveNine
print("\(pi)")


let integerPi = Int(pi)
print("\(integerPi)")

let aString = String(format: "%X", decimalInteger)

print(aString)

let anotherString = String(format: "%O", decimalInteger)
print(anotherString)