#!/usr/local/bin/swift
#!/usr/bin/env swift
#if os(OSX)
    import Cocoa
#elseif os(iOS)
    import UIKit
#elseif os(Linux)
    import Glibc
#endif
let finish = 2.0
var d = finish / 2
var f = d
for i in 0...53 {
    let s = String(format:"%.17g", d)
    if Double(s)! != d {
        print("Round trip failed: \(Double(s)! - d)")
        break;
    }
    print(s)
    f /= 2
    d += f
}