1.定义一个FDAcount类，用于描述一个定期存折(fiked deposi)， 实现现金支取、余额合计、信息显示等。存折基本信息包含账易，账户名称。存款余额、存款期限（以月为单位）、存款利率 （以百分点为单位）等。用c++

在C++中，我们可以创建一个名为`FDAcount`的类来表示定期存折，包括相关的属性和函数。以下是这个类的一个基础实现：

#include <iostream>
#include <string>

class FDAcount {
public:
    // 构造函数，初始化基本信息
    FDAcount(const std::string& account_name, double initial_balance,
             int deposit_term_months, double interest_rate)
        : account_name(account_name), current_balance(initial_balance),
          deposit_term(deposit_term_months), annual_interest_rate(interest_rate) {}

    // 现金支取函数
    void withdraw_cash(double amount) {
        if (amount <= current_balance) {
            current_balance -= amount;
            std::cout << "Withdrawal successful! New balance: $" << current_balance << std::endl;
        } else {
            std::cerr << "Insufficient funds!" << std::endl;
        }
    }

    // 余额合计
    double calculate_total_balance() const {
        return current_balance + total_interest();
    }

    // 计算总利息
    double total_interest() const {
        double monthly_interest = annual_interest_rate / 100.0 / 12.0;
        return current_balance * monthly_interest * deposit_term;
    }

    // 信息显示
    void display_info() const {
        std::cout << "Account Name: " << account_name << "\n";
        std::cout << "Current Balance: $" << current_balance << "\n";
        std::cout << "Deposit Term (months): " << deposit_term << "\n";
        std::cout << "Annual Interest Rate: " << annual_interest_rate << "%\n";
    }

private:
    std::string account_name;
    double current_balance;
    int deposit_term;
    double annual_interest_rate; // 转换成每月利率
};

int main() {
    FDAcount my_deposit("Alice's Savings", 5000.0, 12, 2.5);
    my_deposit.display_info();
    my_deposit.withdraw_cash(2000.0);
    my_deposit.display_info();
    std::cout << "Total Balance including interest: $" << my_deposit.calculate_total_balance() << std::endl;

    return 0;
}

在这个例子中，`FDAcount`类包含了构造函数、提取现金方法、计算总余额方法以及显示账户信息的方法。`main`函数展示了如何创建一个`FDAcount`对象并操作它。