Question

这是一个评估问题，我需要以下方面的帮助： ” 使用包含以下内容的代码创建银行应用程序：

客户类别：
1. ID：整数
2. 名称：字符串
3. balance：双重属性
银行类
1. 客户数组属性
2. 构造函数，它接收count作为参数，并根据count动态构建客户数组：
  1. 创建时，应将最低余额500分配给客户。
  2. 客户ID必须从1开始，并应增加1。
  3. deposit(id:Int, amount:Double)->Void将金额存入ID。
  4. withdraw(id:Int,amount:Double)->Void退出ID（保持最低余额500）
  5. getCustomer(ID:Int)->返回指定ID的客户，否则返回nil。

到目前为止我得到的代码：

import Foundation

/* Editable Code */
class Customer{
    var id:Int
    var name:String
    var balance:Double
    init(id:Int,name:String,balance:Double){
        self.id = id
        self.name = name
        if(self.balance <= 0){
            self.balance = 500
        } else {
            self.balance = balance
        }
    }
}
class Bank: Customer{
    // create customer array with name customers
    var customers:Array = [
        Customer(id:123,name:"Ben",balance:12340.00),
        Customer(id:124,name:"Tom",balance:12350.00),
        Customer(id:125,name:"Jerry",balance:12389.90)
    ]
    var count:Int = 1
    init(count:Int){
        self.count = count
    }
    //implement deposit, withdraw , and getCustomer
    func deposit(id:Int,amount:Double) -> Void {
        if(balance >= 0){
            balance = balance + amount
        }
    }
    func withdraw(id:Int,amount:Double) -> Void {
        if amount > 0.0 {
            if balance - amount >= 500.0 {
                balance = balance - amount
            }
        }
    }
    func getCustomer(id:Int) -> Customer {
        if(Customer[id] == id){
            return Customer
        }
    }
}
/*End of Editable Code*/
/*Uneditable Code from Here*/
let stdout = ProcessInfo.processInfo.environment["OUTPUT_PATH"]!
FileManager.default.createFile(atPath: stdout, contents: nil, attributes: nil)
let fileHandle = FileHandle(forWritingAtPath: stdout)!

guard let custCount = Int((readLine()?.trimmingCharacters(in: .whitespacesAndNewlines))!)
    else { fatalError("Bad input") }

guard let testCaseCount = Int((readLine()?.trimmingCharacters(in: .whitespacesAndNewlines))!)
    else { fatalError("Bad input") }

var bank = Bank(count:custCount)

guard let id = Int((readLine()?.trimmingCharacters(in: .whitespacesAndNewlines))!)
    else { fatalError("Bad input") }

for _ in 1...testCaseCount {
    guard let ops = Int((readLine()?.trimmingCharacters(in: .whitespacesAndNewlines))!)
        else { fatalError("Bad input") }

    guard let amount = Double((readLine()?.trimmingCharacters(in: .whitespacesAndNewlines))!)
        else { fatalError("Bad input") }

    switch ops{
    case 1 ://deposit
        bank.deposit(id:id,amount:amount)
    case -1 : //withdraw
        bank.withdraw(id:id,amount:amount)
    default : break

    }
}



let cust:Customer! = bank.getCustomer(id:id)
fileHandle.write(String(bank.customers.count).data(using: .utf8)!)
fileHandle.write("\n".data(using: .utf8)!)

if cust != nil {
    fileHandle.write(String(cust.balance).data(using: .utf8)!)
}

我苦苦挣扎的部分是上面的客户数组属性。

需要有关如何创建上述客户数组属性的指针

请让我知道如何修改我的代码以达到上述要求。非常感谢您提供任何帮助。

更新2）在此处添加了解决方案，因为很少有人以为我没问对问题：

使用了Bradley Mackey提示并致力于此解决方案。 解决方案

import Foundation
/* Editable Code */

class Bank: Customer{
    // create customer array with name customers
    var customers:[Customer]
    /*var customers:Array = [
     Customer(id:1,name:"Ben",balance:12340.00),
     Customer(id:2,name:"Tom",balance:12350.00),
     Customer(id:3,name:"Jerry",balance:12389.90)
     ]*/
    var count:Int = 0
    init(count:Int){
        NSLog("C: \(count)")
        self.count = count
        customers = []
        var id:Int = 1
        var name:String = ""
        var balance:Double = 500.00
        for i in 1...count {
            id = i
            customers.append(Customer(id:id,name:name,balance:balance))
        }
        super.init(id:id,name:name,balance:balance)
    }
    //implement deposit, withdraw , and getCustomer
    func deposit(id:Int,amount:Double) -> Void {
        NSLog("Deposit init: \(id) \(amount) \(count)")
        if(id > count){
            NSLog("\(id) > \(count)")
        }
        if(id == count){
            customers[id-1].balance = customers[id-1].balance + amount
            NSLog("\(id) = \(count) balance after deposit is \(customers[id-1].balance)")
        }
        if(id < count) {
            for i in 1...id{
                NSLog("for deposit \(i) \(customers[i-1].id)")
                if(customers[i-1].id == id){
                    customers[i-1].balance = customers[i-1].balance + amount
                    NSLog("\(i)")
                }
            }
            NSLog("\(id) < \(count) balance after deposit is \(customers[id].balance)")
        }
        NSLog("deposit last \(id)  \(amount)")
    }
    func withdraw(id:Int,amount:Double) -> Void {
        NSLog("withdraw: \(id) \(amount)")
        if(id <= count){
            for i in 1...id{
                if(customers[i-1].id == id){
                    if((customers[i-1].balance - amount) > 500){
                        customers[i-1].balance = customers[i-1].balance - amount
                        NSLog("withdraw made \(amount) on  \(i-1)")
                    }
                }
            }
        }
        NSLog("withdraw \(id) \(amount)")
    }
    func getCustomer(id:Int) -> Customer? {
        NSLog("getcus \(id)")
        /*if(id == 1){
         return customers[id]
         }*/
        if(id > count){
            return nil
        }
        if(id == count){
            return customers[id-1]
        }
        if(id < count){
            for i in 0...id {
                if(customers[i].id == id){
                    return customers[i]
                }
            }
        }
        NSLog("Bal: \(customers[id].balance)")
        return nil
    }
}

/*End of Editable Code*/
/*Uneditable Code from Here*/
let stdout = ProcessInfo.processInfo.environment["OUTPUT_PATH"]!
FileManager.default.createFile(atPath: stdout, contents: nil, attributes: nil)
let fileHandle = FileHandle(forWritingAtPath: stdout)!

guard let custCount = Int((readLine()?.trimmingCharacters(in: .whitespacesAndNewlines))!)
else { fatalError("Bad input") }

guard let testCaseCount = Int((readLine()?.trimmingCharacters(in: .whitespacesAndNewlines))!)
else { fatalError("Bad input") }

var bank = Bank(count:custCount)

guard let id = Int((readLine()?.trimmingCharacters(in: .whitespacesAndNewlines))!)
    else { fatalError("Bad input") }

for _ in 1...testCaseCount {
    guard let ops = Int((readLine()?.trimmingCharacters(in: .whitespacesAndNewlines))!)
    else { fatalError("Bad input") }

    guard let amount = Double((readLine()?.trimmingCharacters(in: .whitespacesAndNewlines))!)
    else { fatalError("Bad input") }

   switch ops{
       case 1 ://deposit
                bank.deposit(id:id,amount:amount)
       case -1 : //withdraw
                bank.withdraw(id:id,amount:amount)
       default : break

   }
}



let cust:Customer! = bank.getCustomer(id:id)
fileHandle.write(String(bank.customers.count).data(using: .utf8)!)
fileHandle.write("\n".data(using: .utf8)!)

if cust != nil {
fileHandle.write(String(cust.balance).data(using: .utf8)!)
}

Answer 1

我将给出一些一般性提示，因为这是一项评估。

客户数组属性引用Bank上的此属性。

var customers:Array = [
        Customer(id:123,name:"Ben",balance:12340.00),
        Customer(id:124,name:"Tom",balance:12350.00),
        Customer(id:125,name:"Jerry",balance:12389.90)
    ]

您需要将其设置为一些传递给init'initializer'的客户，这在Swift中被称为。为此，请使用FOR LOOP确定您需要多少个客户，然后在每个客户中创建一个客户，并将每个客户append放入数组。例如：

init(count:Int){
    self.count = count

    // first of all, clear the customers array
    customers = []


    for i in 1...count {
        // CREATE THE CUSTOMER HERE
        // ...
        // use i as the customer id to create each customer, 
        // setting their initial balance to 500, then `append` to `customers`
    }
}

Swift类：银行-创建银行应用程序

1 个答案: