import java.util.Scanner;//name of the package(library)that includes the * class
public class ATM{//name of the program
public static Scanner kbd;//Scanner kbd function
public static void main(String[] args) {// the main program with the word void doesn't let anything out
String userAnswer = null;//declaring the string
Scanner kbd = new Scanner(System.in); // declaring the function
double accountbalance = 0, depositamount = 0, withdrawalbalance= 0;//declaring the variables, accountbalance, depositamount, withdrawalbalance, as double
String acctNum,pwd;//declaring acctNum, pwd as string
String acctres;//declaring acctres as string
int counter=0;//declaring counter as int
int Choice;//declaring Choice as int
do//gives the do-while loop the condition to repeat the statement
{
System.out.println("Please enter your account number: ");//gives the system command to print
acctNum = kbd.nextLine();//getting the inputs and allocating
System.out.println("Please enter your account password: ");//gives the system command to print
pwd = kbd.nextLine();//getting the inputs and allocating
acctres=checkID(acctNum,pwd);//Initializing acctres
if(!acctres.equals("error"))// checking for the situation of the acctres variable for error
{
accountbalance = Double.parseDouble(acctres);//Initializing accountbalance
do//gives the do-while loop the condition to repeat the statement
{
Choice = Menu();//Initializing Menu()
System.out.println(Choice);//gives the system command to print
if (Choice == 1)//checking for input 1
{
System.out.println("Your Balance is: " + accountbalance + "$");//gives the system command to print
}
else if (Choice == 2)//checking for input 2
{
System.out.println("How much would you like to deposit to your account? ");//gives the system command to print
depositamount=kbd.nextDouble();//getting the inputs and allocating
double calculatebalance = Deposit(accountbalance, depositamount);//Initializing calculatebalance
System.out.println("Your Balance with your Deposit now is: " + calculatebalance + "$");//gives the system command to print
}
else if (Choice == 3)//checking for input 3
{
System.out.println("How much would you like to withdrawal from your account? ");//gives the system command to print
withdrawalbalance=kbd.nextDouble();//getting the inputs and allocating
double calculatebalance1 = Withdraw(accountbalance, withdrawalbalance);//Initializing calculatebalance1
System.out.println("You Balance now is: " + calculatebalance1 + "$");//gives the system command to print
}
else// checking for the other inputs except the ones which were mentioned
{
System.out.println("Do you want to Log Out? (Y or N) ");//gives the system command to print
userAnswer=kbd.next();//getting the inputs and allocating
userAnswer=userAnswer.toUpperCase();//to ignore the upper case or lower case input and count them as the same
if (userAnswer.equals("Y"))//checking for the situation of userAnswer for being equal Y which means yes
{
System.out.println("You are now logged out!");//gives the system command to print
System.exit(0);// gives command for the if statement
}
}
}while ((Choice <=4)|| (userAnswer.equals("N")));//Checking input N
}
else// checking for other input except the ones that already were mentioned
{
System.out.println("Error");//gives the system command to print
counter++;//Increasing the counter by 1
System.out.println(counter);//gives the system command to print
}
}while(counter<3);//checking for the counter to be less than 3 or not
System.out.println("You have exceeded the required amount of times.");//gives the system command to print
}
public static String checkID(String acctNum, String pwd)//separating the part from the main program as a new function in the main function
{
String result = "error";//declaring the result as string
// Strings a, b, and c contain the valid account numbers and passwords.
// For each string, the account number is listed first, followed by
// a space, followed by the password for the account, followed by a space,
// followed by the current balance.
String a = "44567-5 mypassword 520.36";//declaring string a which id equal 44567-5 mypassword 520.36 in this function
String b = "12345-6 anotherpassword 48.20";//declaring string b which id equal 12345-6 anotherpassword 48.20 in this function
String c = "54321-0 betterpassword 96.74";//declaring string c which id equal 54321-0 betterpassword 96.74 in this function
String d=a.substring(0,7);//declaring string d in this function
String e=a.substring(8,18);//declaring string e in this function
String eres=a.substring(19);//declaring string eres in this function
String f=b.substring(0,7);//declaring string f in this function
String g=b.substring(8,23);//declaring string g in this function
String gres=b.substring(24);//declaring string gres in this function
String h=c.substring(0,7);//declaring string h in this function
String i=c.substring(8,22);//declaring string i in this function
String ires=c.substring(23);//declaring string ires in this function
if(acctNum.equals(d) && pwd.equals(e))//checking for account number and password
{
result=eres;//gives commands for the if statement
}
else if(acctNum.equals(f) && pwd.equals(g))//checking for account number and password
{
result=gres;//gives commands for the if statement
}
else if(acctNum.equals(h) && pwd.equals(i))//checking for account number and password
{
result=ires;//gives commands for the if statement
}
return result;//to get data out of the function and takes the value with it only once
}
public static double Displaybalance1(double accountbalance)//separating the part from the main program as a new function in the main function
{
return accountbalance;//to get data out of the function and takes the value with it only once
}
public static double Deposit(double accountbalance, double depositamount)//separating the part from the main program as a new function in the main function
{
return accountbalance+ depositamount;//to get data out of the function and takes the value with it only once
}
public static double Withdraw(double accountbalance, double withdrawalbalance)//separating the part from the main program as a new function in the main function
{
double newbalance1 = 0;//declaring the variables, newbalance1, as double
if (withdrawalbalance<=accountbalance)//checking the condition in the parentheses(if withdrawalamount is less than or equal the accontbalance or not)
{
newbalance1 = accountbalance - withdrawalbalance;//gives the system command to print the calculated amount
}
else if (withdrawalbalance>accountbalance)//checking the condition in the parentheses(if withdrawalamount is more than the accontbalance or not)
{
newbalance1 = accountbalance;//declaring the newbalance1 as previous accountbalance without change
System.out.println("error, that is impossible! your account balance still is: " + newbalance1);//gives the system command to print the accountbalance without changing it
}
return newbalance1;//to get data out of the function and takes the value with it only once
}
public static int Menu()//separating the part from the main program as a new function in the main function
{
int Option ;//declaring the variables, Size, as int
do//gives the do-while loop the condition to repeat the statement
{
Scanner kbd1 = new Scanner(System.in);// declaring the function
System.out.println("1. Display Balance ");//gives the system command to print
System.out.println("2. Deposit ");//gives the system command to print
System.out.println("3. Withdraw ");//gives the system command to print
System.out.println("4. Log Out ");//gives the system command to print
System.out.println("Enter your option");//gives the system command to print
Option = kbd1.nextInt();//getting the inputs and allocating
if ((Option<=0)&&(Option > 4))//checking for the statement in parentheses(Smaller or equal 0 or bigger than 4 inputs)
{
System.out.println("Error! Choose again: ");//gives the system command to print
}
}while ((Option<=0)&&(Option > 4));//gives the while loop the condition to stop the repeating statement
return Option;//to get data out of the function and takes the value with it only once
}
}
Unsolved 
