Question

代码的输入是枚举：

public enum Family
{
    WILMA("Wilma", "Flintstone", 5000, 0.05, 10, 35), 
    FRED("Fred", "Flintstone", 15000, 0.075, 7, 30),
    BETTY("Betty", "Rubble", 7500, 0.0375, 10, 25), 
    BARNEY("Barney", "Rubble", 5000, 0.09, 10, 35);

    private final String firstName;
    private final String lastName;
    private final double annualDeposit;
    private final double annualInterest;
    private final int yearsDeposit;
    private final int compoundCalcYr;
}

代码的其他部分是getter，setter和printf＆＃39。

对于这个程序，我随着时间的推移计算复利。为了舍入，我需要为我的所有计算使用BigDecimal数据类型。

第一次运行后循环不正确：

第1年：存款为5000.0，收入为$ 5,250.00。第2年：存款为10000.0，收入为11,025.00美元

但是，第2年应该存入10000.0并且 10762.5获得。

这是我的数学似乎不正确的代码。

for (Family family : Family.values()) // From here onward
    {
        BigDecimal principal = BigDecimal.valueOf(family.getAnnualDeposit());
        BigDecimal rate = BigDecimal.valueOf(family.getAnnualInterest());
        BigDecimal annualDeposit = BigDecimal.valueOf(family.getAnnualDeposit());

        for (int year = 1; year <= family.getCompoundCalcYr(); year++)
        {
            BigDecimal amount = principal.multiply(rate.add(BigDecimal.ONE).pow(year));

            if (year <= 1) //Used as a header only
            {
                System.out.printf("\n%s %s\n", family.getFirstName(), family.getLastName());
            }

            System.out.printf("Year %d: ", year, family.getFirstName());
            System.out.printf("Deposited: %s", principal);
            System.out.printf("\t\tEarned: %s\n", NumberFormat.getCurrencyInstance().format(amount));

            BigDecimal earned = amount;

            if (year <= family.getYearsDeposit())
            {
                //earned = earned.add(annualDeposit); // earned = 5250 deposited should be 10k
                principal = principal.add(annualDeposit); //second run 10k
            }

对于正确方向的任何帮助表示赞赏，谢谢。

使用BigDecimal数据类型：为什么我的数学输出不正确？

0 个答案: