Question

我显示每年的贷款余额和每年支付的利息减少。第一年和第二年总是搞砸了，导致其余的年份不正确。另外，如何为每个条目打印一个具有指定空间的列，除了像我一样使用空格分隔它们？

我的代码：

int year;
periods = loanDurationYears*12;
double annualBalance = 0;
double annualInterest = 0;   
int month = loanDurationYears-(loanDurationYears-1);

            balance = loanAmount;
            double interestForMonth = balance*((interestRate*.01)/12);
            double principalForMonth = monthlyPayment - interestForMonth;
            balance = balance - principalForMonth;
            System.out.println("Annual balances");
            System.out.printf("%s   %s   %s \n","Year","Interest","Balance");

            for(int j=0;j<periods;j++)
            {
                month++;
                year = month/12;

                interestForMonth = balance*((interestRate*.01)/12);
                principalForMonth = monthlyPayment - interestForMonth;
                balance = balance - principalForMonth;
                annualBalance = annualBalance + balance;
                annualInterest = annualInterest + interestForMonth;

                if(month%12 == 0)
                {
                    System.out.printf("%d      %.2f    %.2f \n",year,annualInterest,annualBalance);
                    annualBalance = 0;
                    annualInterest = 0;
                }


            }

我的输出：

Year   Interest   Balance 
1      4852.43    859718.74 
2      5080.12    899718.26 
3      4842.34    857208.50 
4      4588.01    811738.89 
5      4315.96    763103.31 
6      4024.98    711081.35 
7      3713.73    655437.20 
8      3380.81    595918.66 
9      3024.71    532255.97 
10      2643.82    464160.58 
11      2236.40    391323.84 
12      1800.62    313415.64 
13      1334.49    230082.85 
14      835.91    140947.76 
15      302.62    45606.39

输出应该如何显示:(除了未对齐的列之外）

Year    Interest    Loan Balance
1   5965.23          86408.21   
    2   5715.14      82566.33    
    3   5447.64      78456.94    
    4   5161.51      74061.43    
    5   4855.46      69359.87    
6   4528.10      64330.94    
    7   4177.95      58951.87    
    8   3803.41      53198.26    
    9   3402.80      47044.03    
    10  2974.29      40461.31    
    11  2515.95  33420.24    
    12      2025.70  25888.91    
    13  1501.31  17833.19    
    14  940.40   9216.58    
    15      340.45   -0.00

Answer 1

您获得的启动量不正确，因为您在for循环之前调整了余额。看起来你的for循环期望从完全平衡开始，但它已经减少了。您还应该将month的增量移动到循环的末尾，或者将其从零开始而不是1。

这一行总是将month初始化为1.为什么要费心数学呢？

int month = loanDurationYears-(loanDurationYears-1);

Answer 2

我没有测试过这个或任何东西，但它应该有效。我敢肯定这不是最好的解决方案，但像这样的简单应该可以正常工作。

它只是检查变量的大小，然后根据它的大小使用不同的print语句。此外，随着年份的推出，我已经提出了一些应该修复的代码

if(month%12 == 0)
{
    // Set the amount of decimals for all interest rates
    DecimalFormat df = new DecimalFormat("#.##");
    df.format(annualInterest);

    // Get the length of annualInterest
    int n = math.floor(annualInterest);
    int length = (int)(Math.log10(n)+1);

    if (length = 3)
    {
        // Have 1 less space than normal on the print statement
        // Maybe also do a check on the year also as that throws it out when it goes past 10
        if (year > 10)
            System.out.printf("%d     %.2f    %.2f \n",year,annualInterest,annualBalance);
        else
            System.out.printf("%d      %.2f    %.2f \n",year,annualInterest,annualBalance);

    }
    if (length = 2)
    {
        // Have 2 less spaces than normal
    }

    annualBalance = 0;
    annualInterest = 0;
   }

余额减少问题

2 个答案: