本关任务：定义账户类SavingAccount，包含账号，存款金额和月利率。

好的，以下是SavingAccount类的定义：

class SavingAccount:
    def __init__(self, account_num, deposit_amount, monthly_interest_rate):
        self.account_num = account_num
        self.deposit_amount = deposit_amount
        self.monthly_interest_rate = monthly_interest_rate

在上面的代码中，`__init__`方法会在类的对象被创建时自动调用，用于初始化类的属性。这里我们传入了三个参数，分别表示账户号码、存款金额以及月利率。可以通过以下方式创建一个SavingAccount的实例：

my_account = SavingAccount("1234567890", 1000, 0.01)

上面的代码将创建一个账户号码为"1234567890"，存款金额为1000元，月利率为1%的SavingAccount实例，并将其赋值给my_account变量。

相关问题

java创建银行账户类SavingAccount，用静态成员变量存储年利率，用私有成员变量存储存款余额。提供计算年利息的方法和计算月利息（年利息/12）的方法。在主函数中建立SavingAccount的对象saver，从控制台输入存款额度和年利率，输出年利息和月利息。

以下是Java代码实现：

import java.util.Scanner;

public class SavingAccount {
    private double balance; // 存款余额
    private static double annualInterestRate; // 年利率

    public SavingAccount(double balance) {
        this.balance = balance;
    }

    // 设置年利率
    public static void setAnnualInterestRate(double rate) {
        annualInterestRate = rate;
    }

    // 计算年利息
    public double calculateAnnualInterest() {
        return balance * annualInterestRate;
    }

    // 计算月利息
    public double calculateMonthlyInterest() {
        return calculateAnnualInterest() / 12;
    }

    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        System.out.print("请输入存款额度：");
        double balance = scanner.nextDouble();
        System.out.print("请输入年利率：");
        double annualInterestRate = scanner.nextDouble();

        SavingAccount saver = new SavingAccount(balance);
        SavingAccount.setAnnualInterestRate(annualInterestRate);

        double annualInterest = saver.calculateAnnualInterest();
        double monthlyInterest = saver.calculateMonthlyInterest();

        System.out.println("年利息为：" + annualInterest);
        System.out.println("月利息为：" + monthlyInterest);
    }
}

运行结果：

请输入存款额度：10000
请输入年利率：0.05
年利息为：500.0
月利息为：41.666666666666664

创建银行账户类SavingAccount，用静态成员变量存储年利率，用私有成员变量存储存款余额。提供计算年利息的方法和计算月利息（年利息/12）的方法。在主函数中建立SavingAccount的对象saver，从控制台输入存款额度和年利率，输出年利息和月利息。保留两位小数

#include<iostream>
#include<iomanip>
using namespace std;

class SavingAccount{
private:
    static double annualInterestRate;
    double balance;
public:
    SavingAccount(double b){
        balance = b;
    }
    void calculateAnnualInterest(){
        double interest = balance * annualInterestRate;
        cout<<fixed<<setprecision(2)<<"Annual interest: "<<interest<<endl;
    }
    void calculateMonthlyInterest(){
        double interest = balance * annualInterestRate / 12;
        cout<<fixed<<setprecision(2)<<"Monthly interest: "<<interest<<endl;
    }
    static void modifyAnnualInterestRate(double rate){
        annualInterestRate = rate;
    }
};

double SavingAccount::annualInterestRate = 0.0;

int main(){
    double balance, rate;
    cout<<"Input balance: ";
    cin>>balance;
    cout<<"Input annual interest rate: ";
    cin>>rate;
    SavingAccount saver(balance);
    SavingAccount::modifyAnnualInterestRate(rate);
    saver.calculateAnnualInterest();
    saver.calculateMonthlyInterest();
    return 0;
}

输出样例：

Input balance: 1000
Input annual interest rate: 0.05
Annual interest: 50.00
Monthly interest: 4.17