数々のバグを乗り越えて(human errorだろ....)割引現在価値を求めるプログラムを書いた。　ミクロ受講者使うなら使ってね #CodePiece

calculateNetPresentValue.swift

//: Playground - noun: a place where people can play

import UIKit

func jyou(n : Double, x:Int) -> Double {
    var ans = 1.0
    for _ in 1...x{
        ans *= n
    }
    return ans
}

let interest = 400.00
let price = 10400.00
let intRate = 1.02

let endYear1 = 2020
var X = 0
var answer = 0.00
for x in 1..<(endYear1-2017+2){
    answer = answer + (interest / jyou(intRate, x: x))
    X = x
}
let Answer1 = answer + (price / jyou(intRate, x: X+1))

print("The answer of a is")
print(Answer1)

let endYear2 = 2025
answer = 0
for x in 1..<(endYear2-2017+2){
    interest / jyou(intRate, x: x)
    answer = answer + (interest / jyou(intRate, x: x))
    X = x
}

let Answer2 = answer +  (price / jyou(intRate, x: X+1))

print("The answer of b is")
print(Answer2)

print("The answer of c is")
print(interest/(intRate - 1))