//  Miles.swift  Copyright (c) Kari Laitinen

//  http://www.naturalprogramming.com

//  2014-09-23  File created.
//  2015-10-17  Last modification.

/*  This program demonstrates:

    - getting a Double value from the keyboard
    - use of Double variables in simple calculations
    - formatting strings for output

    'Variables' defined with keyword let are constants
    that can be assigned a value only once.
*/

import Foundation

print( "\n This program converts miles to kilometers."
   +   "\n Please, give a distance in miles: ", terminator: "" )

let line_from_keyboard = readLine()!

let distance_in_miles  = Double( line_from_keyboard )!

let distance_in_kilometers = 1.6093 * distance_in_miles

// Almost the same output is generated by using two differing
// output mechanisms.

print( "\n \( distance_in_miles ) miles is \( distance_in_kilometers ) "
   +   "kilometers." )

print( String( format: "\n %.3f miles is %.3f kilometers. \n",
               distance_in_miles, distance_in_kilometers ) )