Swift Class: Bank - Creating a Banking Application [closed] - swift

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This is an assessment question, I need help with:
"
Create a Banking Application with a code containing:
Customer Class with :
ID:Int
name:String
balance:Double attributes
Bank class with
Customer array attribute
Constructor which receives count as parameter, and dynamically builds the customer array based on count:
On Creation, minimum balance of 500 should be assigned to the customer.
Customer ID must start from 1, and should increment by 1.
deposit(id:Int, amount:Double)->Void to deposit amount to ID.
withdraw(id:Int,amount:Double)->Void to withdraw from ID(maintain minimum balance of 500)
getCustomer(ID:Int)->Returns Customer of specified ID, nil otherwise.
The code I got so far:
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)!)
}
Part I am struggling is Customer Array Attribute above.
Need pointers on how to create the above said Customer array attribute
Please let me know how to modify my code to get achieve the above requirement.
Any help on this is much appreciated.
UPDATE 2) Added the solution in here, as it was closed by few, who thought I did not ask right question:
Used Bradley Mackey hint and worked on this solution.
Solution
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

I'll give some general hints as this is an assessment.
The customer array attribute refers to this property on the Bank.
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)
]
You will need to set this to be some customers that is passed to the init 'initializer' as it's called in Swift. To do this, use a FOR LOOP to figure out how many customers you need, then create a customer in each one, and append each one to the array. For example:
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`
}
}