/*
   Interest.swift  (c) Kari Laitinen

   http://www.naturalprogramming.com

   2021-09-14  File created.

   This program demonstrates an initialized two-dimensional array.
*/

import Foundation
 
let compound_interest_table  =
   [
     [ 5.00, 10.25, 15.76, 21.55, 27.63, 34.01, 40.71, 47.75 ],
     [ 6.00, 12.36, 19.10, 26.25, 33.82, 41.85, 50.36, 59.38 ],
     [ 7.00, 14.49, 22.50, 31.08, 40.26, 50.07, 60.58, 71.82 ]
   ]

print( "\n This program calculates the compound interest" +
       "\n for a given sum of money (principal). \n" +
       "\n  Give the loan amount: ", terminator: "" )

let given_sum_of_money = Double( readLine()! )!

print( "\n  Give the interest percentage ( 5, 6, or 7): ", terminator: "" )

let interest_percentage  =  Int( readLine()! )!

print( "\n  Give the loan period in years ( max. 8 ): ", terminator: "" )

let loan_period_in_years  =  Int( readLine()! )!

let compound_interest = ( given_sum_of_money / 100.0 ) *
    compound_interest_table[ interest_percentage - 5 ] [ loan_period_in_years - 1 ]

//print( "\n Compound interest is: \( compound_interest ) \n\n" )

print( String( format: "\n  For a loan of %.2f you must pay"
                     + "\n  %.2f as compound interest after %d years. \n\n",
              given_sum_of_money, compound_interest, loan_period_in_years ) )