投资分析计算器 - 存款总额、年限、本金、利率计算工具

package experiment02; import java.util.Scanner; public class InvestmentAnalysis { public static void main(String[] args) { Scanner scanner = new Scanner(System.in); boolean exit = false;

    while (!exit) {
        System.out.println("请选择要计算的问题：");
        System.out.println("1. 计算存款总额");
        System.out.println("2. 计算需要多少年达到预期存款总额");
        System.out.println("3. 计算需要投入的本金");
        System.out.println("4. 计算年存款利率");
        System.out.println("5. 退出程序");

        int choice = scanner.nextInt();

        switch (choice) {
            case 1:
                calculateTotalAmount();
                break;
            case 2:
                calculateYearsToReachGoal();
                break;
            case 3:
                calculateInitialPrincipal();
                break;
            case 4:
                calculateAnnualInterestRate();
                break;
            case 5:
                exit = true;
                break;
            default:
                System.out.println("无效的选择");
        }
    }

    scanner.close();
}

// 计算存款总额
private static void calculateTotalAmount() {
    Scanner scanner = new Scanner(System.in);
    System.out.print("请输入本金（x）：");
    double x = scanner.nextDouble();
    System.out.print("请输入年存款利率（d）：");
    double d = scanner.nextDouble();
    System.out.print("请输入存款年限（n）：");
    int n = scanner.nextInt();

    double z = x * Math.pow(1 + d, n);
    System.out.println("存款总额为：" + z);
}

// 计算需要多少年达到预期存款总额
private static void calculateYearsToReachGoal() {
    Scanner scanner = new Scanner(System.in);
    System.out.print("请输入本金（x）：");
    double x = scanner.nextDouble();
    System.out.print("请输入年存款利率（d）：");
    double d = scanner.nextDouble();
    System.out.print("请输入存款总额预期值（z）：");
    double z = scanner.nextDouble();

    int n = (int) Math.ceil(Math.log(z / x) / Math.log(1 + d));
    System.out.println("需要 " + n + " 年达到存款总额预期值");
}

// 计算需要投入的本金
private static void calculateInitialPrincipal() {
    Scanner scanner = new Scanner(System.in);
    System.out.print("请输入年存款利率（d）：");
    double d = scanner.nextDouble();
    System.out.print("请输入存款年限（n）：");
    int n = scanner.nextInt();
    System.out.print("请输入存款总额预期值（z）：");
    double z = scanner.nextDouble();

    double x = z / Math.pow(1 + d, n);
    System.out.println("需要投入的本金为：" + x);
}

// 计算年存款利率
private static void calculateAnnualInterestRate() {
    Scanner scanner = new Scanner(System.in);
    System.out.print("请输入本金（x）：");
    double x = scanner.nextDouble();
    System.out.print("请输入存款年限（n）：");
    int n = scanner.nextInt();
    System.out.print("请输入存款总额预期值（z）：");
    double z = scanner.nextDouble();

    double d = Math.pow(z / x, 1.0 / n) - 1;
    System.out.println("年存款利率为：" + d);
}

}