淨現值程式碼

import java.util.Scanner;

public class Main {


    public static void main(String[] args) {

        Scanner sc = new Scanner(System.in);
        System.out.println("請輸入成本");
        double chengben = sc.nextDouble();
        System.out.println("請輸入貼現率");
        double rate = sc.nextDouble();
        System.out.println("請輸入年限");
        int year = sc.nextInt();
        //定義一個陣列
        double[] flows = new double[year];
        for (int i = 0; i < year; i++) {
            System.out.println("請輸入第" + (i + 1) + "年的錢");
            flows[i] = sc.nextDouble();

        }
        double npy = 0;
        npy = npvjisuan(chengben, flows, rate, year);


        double originalValue = npy; // 需要四捨五入的原始值
        double roundedValue = Math.round(originalValue * 100.0) / 100.0; // 進行四捨五入並保留兩位小數


        System.out.println(roundedValue);


    }

    public static double npvjisuan(double chengben, double[] liu, double rate, int year) {
        double npv = chengben;
        for (int i = 0; i < year; i++) {
            npv += liu[i] / Math.pow(1.0 + rate, i + 1);

        }


        return npv;
    }


}