3月11日

今天完成了王輝老師要求的淨現值計算 以下為程式碼

package tast;

import java.math.BigDecimal;

public class Tast {

    public static void main(String[] args) {
        // TODO 自動生成的方法存根

        // 建立二維陣列儲存每個專案每年利潤
        int [][] money = new int [5][4];

        // 填入利潤
        money[0][0] = -100000; money[0][1] = -1000000; money[0][2] = -100000; money[0][3] = -120000;
        money[1][0] = 10000; money[1][1] = 200000; money[1][2] = 30000; money[1][3] = 30000;
        money[2][0] = 10000; money[2][1] = 200000; money[2][2] = 30000; money[2][3] = 30000;
        money[3][0] = 10000; money[3][1] = 200000; money[3][2] = 30000; money[3][3] = 30000;
        money[4][0] = 20000; money[4][1] = 200000; money[4][2] = 30000; money[4][3] = 30000;


        // 貼現率陣列  貼現因子
        double[] txl = new double[] {0.08,0.12};
        double [] [] tx = new double [2][6];

        // 貼現因子計算
        for (int i = 0; i < 2; i++) {
            for (int j = 0; j < 6; j++) {
                // 計算貼現因子
                tx[i][j] = 1/Math.pow(1+txl[i], j);
                // 將因子四捨五入
                BigDecimal b = new BigDecimal(tx[i][j]);
                tx[i][j] = b.setScale(4, BigDecimal.ROUND_HALF_UP).doubleValue();
                // 輸出
                if(i==0)
                    System.out.println("貼現率為0.08 ,  第"+j+"年的貼現因子為 : "+tx[i][j]);
                else
                    System.out.println("貼現率為0.12 ,  第"+j+"年的貼現因子為 : "+tx[i][j]);
            }
        }


        // 淨現值計算
        for (int i = 0; i < 2; i++) {
            for (int j2 = 0; j2 < 4; j2++) {
                double jx = 0 ;
                for (int j = 0; j < 6; j++) {
                    // 計算每年淨現值
                    jx = money[j][j2] * tx[i][j]+jx;
                }
                // 輸出
                if(i==0)
                    System.out.println("貼現率為0.08 , 專案"+(j2+1)+" 的淨現值為 : "+jx);
                else
                    System.out.println("貼現率為0.12 , 專案"+(j2+1)+" 的淨現值為 : "+jx);
            }
        }
    }

}