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For some reason I get a syntax error that says, "Syntax error, insert "}" to complete ClassBody." I checked every method, every statement to make sure I have complete opening and closing brackets, so I don't know why this is happening. Can anybody tell me why I might be getting this issue?
Copying the code into another file doesn't fix the problem, nor does going to Project > Clean.
import java.util.Scanner;
public class jloneman_Numerology
{
private String[] report;
private int day, month, year, num;
public jloneman_Numerology()
{
introduction();
report = new String[9];
num = 0;
}
public void introduction()
{
System.out.println("Welcome to ACME Numerology Reports! We will " +
"determine your special\nnumerology report based on your " +
"birth date.\n");
}
public void getDate()
{
char slash1, slash2;
do
{
System.out.print("Please enter your birth date (mm / dd / yyyy): ");
Scanner in = new Scanner(System.in);
String date = in.nextLine();
month = in.nextInt();
day = in.nextInt();
year = in.nextInt();
slash1 = date.charAt(3);
slash2 = date.charAt(8);
} while (validDate(slash1, slash2) == false);
calcNum();
}
public boolean validDate(char slash1, char slash2)
{
boolean isValid = true;
// Check for valid month
if (month < 1 || month > 12)
{
isValid = false;
System.out.printf("Invalid month: %d\n", month);
}
// Check for valid day
if (day < 1 || day > 31)
{
isValid = false;
System.out.printf("Invalid day: %d\n", day);
}
// Check for months with 30 days, else 31 days = invalid
if ((month == 4 || month == 6 || month == 9 || month == 11) && (day < 1 || day > 30))
{
isValid = false;
System.out.printf("Invalid day: %d\n", day);
}
else if (day < 1 || day > 31)
{
isValid = false;
System.out.printf("Invalid day: %d\n", day);
}
// Check for valid year
if (year < 1880 || year > 2280)
{
isValid = false;
System.out.println("Please enter a valid year between 1880 and 2280.");
}
// Check for correct separating character
if (slash1 != '/' || slash2 != '/')
{
isValid = false;
System.out.println("Invalid separating character, please use forward slashes");
}
if (leapYear() == true)
{
if (month == 2 && day > 29)
{
isValid = false;
System.out.printf("Invalid day for 2/%d: %d", year, day);
}
}
return isValid;
}
public boolean leapYear()
{
boolean isLeap;
if (year % 4 == 0 && year % 400 != 0)
isLeap = false;
else
isLeap = true;
return isLeap;
}
public void calcNum()
{
// Separate each digit of the date and add to a single number
// Test number for debugging
num = 5;
}
public void printReport()
{
report[0] = ":1: ";
report[1] = ":2: ";
report[2] = ":3: ";
report[3] = ":4: ";
report[4] = ":5: ";
report[5] = ":6: ";
report[6] = ":7: ";
report[7] = ":8: ";
report[8] = ":9: ";
System.out.println(report[num]);
}
}
78,0-1 Bot
Try removing (or commenting out) one method and see if the problem persists. If it does, remove or comment out an additional method, and so on, until the error disappears. Then restore everything but the last method.
If the error doesn't reappear, the problem is probably in that last method.
If it does reappear, the problem is more subtle; perhaps a control character embedded in the code. Try copying and pasting the code into a text-only editor (so any control characters will be ignored, save it, and recompiling.
I too had this error.
There are NO errors in the code above (when I used the code above as as a sub class).
I corrected my error by cleaning up my IDE's workspace and making sure the caller was working properly.
Project settings
Run settings
Made sure that main was listed properly
public static void main(String[] args) { ... }
I have faced the similar problem, solved it by deleting the class file and then recreated the file again and pasted the same code. It worked.
Take out the System.out.println and put it into the main function instead of the introduction() inside of the main(String[] args).
Related
so i have a problem validating the last section of this code where i have commented
public void newTicket() throws Exception {
boolean validation = false;
boolean phoneUnique = false;
int num;
int member;
String memberPhoneNum;
final int memTicket = 80;
final int nonMem = 100;
int min = 100;
int max = 200;
int random_int = (int) Math.floor(Math.random() * (max - min + 1) + min);
int dd;
int mm;
int yy;
String ticketDate;
boolean isTrueDate = true;
System.out.println();
System.out.println("Transaction Id: " + random_int);
int transactionId = random_int;
do {
System.out.print("Enter Day: ");
dd = scan.nextInt();
System.out.print("Enter Month");
mm = scan.nextInt();
System.out.print("Enter Year");
yy = scan.nextInt();
ticketDate = (dd + "" + mm + "" + yy);
System.out.println("Ticket date: " + ticketDate);
validation = v.checkDate(ticketDate);
if (!isTrueDate) {
System.out.println("Invalid"); // PROBLEM WITH VALIDATION
}
} while (!isTrueDate);
Whenever i enter a wrong date, for example: 300224, it still proceeds to the next line. ive tried changing the true/false statements but it still does work how i want it to.
public static boolean checkDate(String ticketDate) {
boolean isTrueDate = true;
int day = 0;
int month = 0;
int year = 0;
if (month > 12) {
isTrueDate = false;
} else if (month == 1 || month == 3 || month == 5 || month == 7 || month == 8 || month == 10 || month == 12) {
if (day <= 31) {
isTrueDate = true;
} else if (day >= 31) {
isTrueDate = false;
}
} else if (month == 4 || month == 6 || month == 9 || month == 11) {
if (day <= 30) {
isTrueDate = true;
} else if (day >= 30) {
isTrueDate = false;
}
} else if (month == 2) // February check
{
if (year % 4 == 0) // Leap year check for February
{
if (day <= 29) {
isTrueDate = true;
} else if (day >= 29) {
isTrueDate = false;
}
} else if (year % 4 != 0) {
if (day <= 28) {
isTrueDate = true;
} else if (day >= 28) {
isTrueDate = false;
}
}
}
return isTrueDate;
This is my validation class to test for leap years and whatnot
I appreciate any help given
I am new to this site too, but I can try to give you a response that may help.
This is going to be a long one, as I have a lot of potential issues to solve. I will provide something that I think could work at the end though.
The first thing I noticed is that your long series of conditionals involves a lot of brackets and you may have missed one as you nested many of them into each other. I did a thorough check and really, the only one I did not see was the one that should end the boolean method after return isTrueDate; so I thought I should mention it just in case. To be clear, you probably have it, but make sure you have a bracket that closes the method. Also in the future, make sure to put the whole code snippet for clarity. Thanks in advance.
Now the second thing I see is the way you got the validation. I do not know exactly what you mean when you say validation = v.checkDate(ticketDate); in the first code snippet because I do not know what v is, although I will assume it is the main class. In this case, while I am not sure, it looks like you are trying to run your method and assign the boolean value of whether the date is a real date to the value of validation. This makes sense, but what I think you should change is how you used isTrueDate to verify by asking if the value is not isTrueDate. I think it might solve an issue if you simply put an invalid response on validation being false and vice versa for validation being true. Here's an example:
validation = v.checkDate(ticketDate);
if (validation == true) {
//Something here if you want.
//However you may not need this space.
} else {
System.out.println("invalid")
}
However, with this, there are really two approaches that I can think of: the one that preserves security and the one that ensures your code is working.
So the code above is better at preserving security b/c it accounts for anything that may not make the validation false in the else statement in addition to it being false because your code worked properly. For example, if your series of conditionals has a flaw in it, b/c you initialized validation as being false, if something goes wrong, its likely to just invalidate the ticket, which could be semi-useful in a security sense to avoid some vulnerabilities. However, you can do that later. The first thing you need to make sure of is that your code works properly, so I would also recommend that when you declare validate at the top of your first code snippet, to not initialize it.
Like this:
boolean validation;
Instead of this:
boolean validation = false;
This ensures that your series of conditionals is responsible for the value of validation rather than the conditions simply not working and the value being false by default.
This brings me to another thing that I believe would also cause problems in your code.
It refers to this section from your first code snippet:
boolean isTrueDate = true;
System.out.println();
System.out.println("Transaction Id: " + random_int);
int transactionId = random_int;
So two things:
The easy one refers to the bottom two lines. It's not a mistake causing you errors, but I would suggest switching the order of the bottom two lines to assign transactionId to the value of random_int and then printing:
System.out.println("Transaction Id: " + transactionId);
Now the second one is the real problem. In the code above you are assigning true to isTrueDate.
This is a problem because you are later using isTrueDate in that series of conditionals in that other boolean method called checkDate()
This will mess up your code. Here is how:
So first the isTrueDate you used inside your method, checkDate() is kept local to that method because you declared it inside there. If you did not do this, you likely would have gotten a separate error because you declared a boolean isTrueDate in two separate places. You declared it at the top in that first code snippet, and you declared it in that method. Normally, this would cause an error because you have already declared it once and changing the value would only require you to assign isTrueDate to something else with an equal sign rather than declaring it again. To really show you what I mean, look at this example:
Incorrect:
boolean isTrueDate = true;
//Other actions
//I want to change the value of isTrueDate
boolean isTrueDate = false;
Correct:
boolean isTrueDate = true;
//Other actions
//I want to change the value of isTrueDate
isTrueDate = false;
What you did (doesn't return error but messes up your code):
I put it in a different order to better show the problem.
public static boolean checkDate(String ticketDate) {
boolean isTrueDate = true; //first declaration
//Lots of conditions
}
static void someMethod() {
//This method may not be exactly how you did it,
//but you did not show me that.
boolean isTrueDate = true; //usually invalid second declaration.
//However, it still works b/c they are in different methods and
// thus kept separate from each other. This still messes up your
// code though
//more code
validation = v.checkDate(ticketDate);
if (!isTrueDate) {
System.out.println("Invalid");
}
//Doesn't work b/c the value of isTrueDate you initialized
// in someMethod() is the one that this if else statement checks
// instead of the one that you used in checkDate()
//That means, isTrueDate will always be true.
//To solve this, you must first use validation to present the
// invalid message as discussed above, but furthermore, you should
// delete the initialization of isTrueDate in the method that is
// not checkDate() because you don't need it there.
}
Sorry, that's a lot to explain, and there may be more to fix, but I have one more correction for now: I looked through the conditionals that you used to account for all the ways a date could be correct or incorrect and I think its pretty good for the most part, but I can offer one thing that will save you some lines.
Every time you check if a date is within the max number of days for that month, you then put a separate else if condition that accounts for the other of the two possibilities. Here's an example from your code:
if (day <= 31) {
isTrueDate = true;
} else if (day >= 31) {
isTrueDate = false;
}
This does help to show exactly what is happening, but I would still advise deleting this else if part and replacing it with one big else {} part at the end because it would say the same thing as all of these other separate else if blocks, just much more concisely. Here is what that would look like:
//This new list of conditions will work such that it finds every true
// possibility and denies everything else.
if (month < 12) //Changed to fit new strategy
{
if (month == 1 || month == 3 || month == 5 || month == 7 || month == 8 || month == 10 || month == 12)
{
if (day <= 31)
{
isTrueDate = true;
}
} else if (month == 4 || month == 6 || month == 9 || month == 11)
{
if (day <= 30)
{
isTrueDate = true;
}
} else if (month == 2) // February check
{
if (year % 4 == 0) // Leap year check for February
{
if (day <= 29)
{
isTrueDate = true;
}
} else if (year % 4 != 0)
{
if (day <= 28)
{
isTrueDate = true;
}
}
}
} else { // All the times it was false
isTrueDate = false;
}
return isTrueDate;
So there you have it. As thorough as I could because in truth, this is my first answered question and I wanted to do it right. I hope it helps in some way. The main thing is to make sure that the data you received from the scanner correctly enters into the method and that the right data from that method goes to your validation. I'll leave you with everything I can think to correct on both snippets.
New Snippet 1:
public void newTicket() throws Exception {
boolean validation;
boolean phoneUnique = false;
int num;
int member;
String memberPhoneNum;
final int memTicket = 80;
final int nonMem = 100;
int min = 100;
int max = 200;
int random_int = (int) Math.floor(Math.random() * (max - min + 1) + min);
int dd;
int mm;
int yy;
String ticketDate;
//Removed unnecessary declaration of isTrueDate in this part
System.out.println(); //I don't know why you have this but I will leave it alone.
int transactionId = random_int; //Switched
System.out.println("Transaction Id: " + transactionId);
do { // I like this part
System.out.print("Enter Day: ");
dd = scan.nextInt();
System.out.print("Enter Month");
mm = scan.nextInt();
System.out.print("Enter Year");
yy = scan.nextInt();
ticketDate = (dd + "" + mm + "" + yy);
System.out.println("Ticket date: " + ticketDate);
validation = v.checkDate(dd, mm, yy); //This change is explained in snippet 2
if (validation == false) { //uses validation instead of isTrueDate
System.out.println("Invalid"); // Hopefully this helps
}
} while (!isTrueDate); //I don't know what happens here so I won't touch.
//Code that was not shown
New Snippet 2:
//parameters changed
public static boolean checkDate(int day, int month, int year) {
boolean isTrueDate; //Changed out of preference
//int day = 0;
//int month = 0; No longer needed in this new code.
//int year = 0;
//One more problem:
//It looks like you tried to use ticketDate as the parameter
// to get the values for days, month, and year, but this
// doesn't quite work b/c there is not anything that takes that
// string and then extracts the values for day, month and year.
//The way I chose to address this was by placing the day, month,
// and year as parameters in the checkDate() method, and then
// calling checkDate() in snippet one with the values of the
// scanner.
//However, there are other ways to do this. For example, you could
// keep your ticketDate String and then access different parts of
// that String to get the values of day, month, and year.
//In the end, I just did what seemed easiest to me.
//This new list of conditions will work such that it finds every true
// possibility and denies everything else.
if (month < 12) //Changed to fit new strategy
{
if (month == 1 || month == 3 || month == 5 || month == 7 || month == 8 || month == 10 || month == 12)
{
if (day <= 31)
{
isTrueDate = true;
}
} else if (month == 4 || month == 6 || month == 9 || month == 11)
{
if (day <= 30)
{
isTrueDate = true;
}
} else if (month == 2) // February check
{
if (year % 4 == 0) // Leap year check for February
{
if (day <= 29)
{
isTrueDate = true;
}
} else if (year % 4 != 0)
{
if (day <= 28)
{
isTrueDate = true;
}
}
}
} else { // All the times it was false
isTrueDate = false;
}
return isTrueDate;
} //The extra bracket! Closes the method
Peace <3
This question already has answers here:
Java variable scope in if statement [duplicate]
(5 answers)
Closed 5 years ago.
I was attempting to code a program that gives you the season based on an inputed month and day, but ran into a problem halfway through. After I intialize the variable month in an if statement, to check if the value inputed is a valid month, I cannot use the variable month later in the code to find the season as it gives me the error "cannot find symbol." Any help would be much appreciated.
import java.util.Scanner;
public class Date
{
public static void main(String [] args)
{
Scanner in = new Scanner(System.in);
System.out.println("Please enter the number of the month: ");
if (in.hasNextInt() && in.nextInt() > 0 && in.nextInt() <= 12)
{
int month = in.nextInt();
}
else
{
System.out.println("Error: Invlaid month value");
}
System.out.println("Please enter the day: ");
int day = in.nextInt();
String season;
if (0 < month && month <= 3)
{
season = "Winter";
}
else if (3 < month && month <= 6)
{
season = "Spring";
}
else if (6 < month && month <= 9)
{
season = "Summer";
}
else if (9 < month && month <= 12)
{
season = "Fall";
}
}
}
The problem you encounter is that you have declared the variable within the if statement, meaning it may only be accessed within the { }. This article goes over the basics of variable scope in Java. You will only be able to access a variable from a scope if the variable was defined in a scope that is a subset of the current scope.
To achieve what you want, you will need to declare the variable outside the if-statement so that it can be accessible. Note you will need to handle the case when month is invalid otherwise you will have the default value of 0.
int month = 0;
if (in.hasNextInt()) {
month = in.nextInt();
if (!(month > 0 && month <= 12)) {
month = 0;
System.out.println("ERROR");
}
} else {
// Handle graceful exit
}
...
if (0 < month && month <= 3) { ... }
my code doesn't return any value and i have no idea why. My assignment requires me to write a code that accepts date in mm/dd/yyyy format and im required to put leap year in. The problem is, i dont get back any input. Im an amateur ad i dont know what is wrong. Im also allowed to use Case statment but I'm not sure how to implement case.
import java.util.Scanner;
public class Question1 {
public static void main(String[] args) {
Scanner sc = new Scanner(System.in).useDelimiter("/");
System.out.println("Please enter a date in mm/dd/yyyy format: ");
String mm = sc.next();
String dd = sc.next();
String yyyy = sc.next();
int month = Integer.parseInt(mm);
int day = Integer.parseInt(dd);
int year = Integer.parseInt(yyyy);
if (month <= 0 || month>12)
{
System.out.println("invalid month ");
}
if (year%4 != 0 || month == 02 || day >= 29)
{
System.out.println("invalid date");
}
if (month == 4 || month == 6 || month == 9 || month == 11 || day >= 31)
{
System.out.println("Invalid day");
}
if (month == 1 || month == 3 || month == 5 || month == 7 || month == 8 || month == 10 || month == 12 || day >=32 )
{
System.out.println("Invalid day");
}
else
{
System.out.println("Valid date");
}
}
}
The code sets the delimiter to /. Then you enter something like 12/25/2016. The first sc.next() call gets the 12. The second one gets the 25. The third... waits, because it doesn't see another / so it doesn't know you're done. If you typed 12/25/2016/ with your current code, it would at least give output, even if that output isn't correct yet.
you want to use switch case then go through the below code:
import java.util.Scanner;
public class Question1 {
public static void main(String[] args) {
Scanner sc = new Scanner(System.in).useDelimiter("/");
System.out.println("Please enter a date in mm/dd/yyyy/ format: ");
String mm = sc.next();
String dd = sc.next();
String yyyy = sc.next();
int month = Integer.parseInt(mm);
int day = Integer.parseInt(dd);
int year = Integer.parseInt(yyyy);
boolean valid = isValidDate(day,month,year);
if (valid == true)
{
System.out.println("Date is Valid");
}
else
{
System.out.println("Date is InValid");
}
}
public static boolean isValidDate(int day, int month ,int year)
{
boolean monthOk = (month >= 1) && (month <= 12);
boolean dayOk = (day >= 1) && (day <= daysInMonth(year, month));
return (monthOk && dayOk);
}
private static int daysInMonth(int year, int month) {
int daysInMonth;
switch (month) {
case 1:
case 3:
case 5:
case 7:
case 8:
case 10: // go through
case 12:
daysInMonth = 31;
break;
case 2:
if (((year % 4 == 0) && (year % 100 != 0)) || (year % 400 == 0)) {
daysInMonth = 29;
} else {
daysInMonth = 28;
}
break;
default:
// returns 30 even for nonexistant months
daysInMonth = 30;
}
return daysInMonth;
}
}
take input as 12/25/2016/, not this 12/25/2016.
Here is something to get you started:
final String DELIMITER = "/";
Scanner sc = new Scanner(System.in);
System.out.println("Please enter a date in mm/dd/yyyy format:\n ");
String date = sc.next();
sc.close();
String[] dateParts = date.split(DELIMITER);
//check : if dateParts size is not 3 ....something is wrong
String mm = dateParts[0];
String dd = dateParts[1];
String yyyy = dateParts[2];
System.out.println(mm+" "+ dd +" "+ yyyy);
It seems you have put else in wrong place. Suppose you second condition is getting correct and all other false, then also your program will show it as valid date and same on the opposite side.
For example, say day is 30 for any date, then it will satisfy second condition and it will show you "Invalid date".
You should write if else as follows.
If{
If{
If{
}
}
}else{
}
All if must be in a nested if and then else. Your if else sequence is wrong.
Closed. This question needs debugging details. It is not currently accepting answers.
Edit the question to include desired behavior, a specific problem or error, and the shortest code necessary to reproduce the problem. This will help others answer the question.
Closed 6 years ago.
Improve this question
import java.util.Scanner;
public class LeapYearTester{
public static void main(String[] args){
Scanner input = new Scanner(System.in);
System.out.println("Please enter a year");
int year_input = input.nextInt();
// now make a Year object
Year theYear = new Year(year_input);
// now check to see if it's a leap year
if (theYear.isLeapYear())
System.out.println("That's a leap year!");
else
System.out.println("That's not a leap year!");
}
}
public class Year
{
// declare your instance variables here
private int theYear;
private int Year;
// write your constructor here
public Year(int y)
{
y=Year;
}
static boolean isLeapYear(final int Year) {
return Year % 4 == 0 && (Year % 100 != 0 || Year % 400 == 0);
//(((Year%4==0) || (Year%400)) && ((!Year%100==0) || (Year%400=0)))
}
}
The above is the Main and cannot be changed. Having trouble with class.
Not much modification of your original attempt other than adding a check to see if the user entered a valid year in this case between 1000 and 2999 inclusive using regex (I will leave it as a task for you to modify this code for what you consider as a valid year):
import java.util.Scanner;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class LeapYearTester {
public static void main(String[] args){
Scanner input = new Scanner(System.in);
System.out.print("Please enter a year: ");
String yearInput = "";
String pattern = "^[12][0-9]{3}$";
Pattern r = Pattern.compile(pattern);
//checking is valid year
while(input.hasNext()){
yearInput = input.nextLine();
Matcher m = r.matcher(yearInput);
if(m.find()) {
System.out.println("You entered the valid year: " + m.group(0));
break;
} else {
System.out.println("Error: Not a valid year");
System.out.print("Please enter a year between 1000 and 2999 inclusive: ");
}
}
Year theYear = new Year(Integer.valueOf(yearInput));
if(theYear.isLeapYear()) {
System.out.println("That's a leap year!");
} else {
System.out.println("That's not a leap year!");
}
}
public static class Year {
private int year;
private Year(int y) {
year = y;
}
private boolean isLeapYear() {
if (year % 4 != 0) {
return false;
} else if (year % 400 == 0) {
return true;
} else if (year % 100 == 0) {
return false;
} else {
return true;
}
}
}
}
Example usage: Testing a leap year
Please enter a year: 2016
You entered the valid year: 2016
That's a leap year!
Example usage: Invalid input and testing a non leap year
Please enter a year: 3000
Error: Not a valid year
Please enter a year between 1000 and 2999 inclusive: 2015
You entered the valid year: 2015
That's not a leap year!
Try it here!
I have a small problem. I figured out how to solve this program, but I can't get the output to output ALL the leap years in a table format. Instead, the output shoots out the leap years one at a time, which is something I don't want with my program.
What could be the problem?
EDIT:
I'm trying to get all the years to pop out using a "JOptionPane" message box (JOptionPane.showMessageDialog(null, " ");), but I keep getting only one output per box and many boxes... compared to all the outputs in just one box.
Here is the code:
String enterYear = JOptionPane.showInputDialog(null, "Enter the starting year: \nExample: 2015"); // User enters an input (Year)
String enterLastYear = JOptionPane.showInputDialog(null, "Enter the ending year: ");
int i = Integer.parseInt(enterYear);
if (Integer.parseInt(enterYear) < Integer.parseInt(enterLastYear)){
for (i = Integer.parseInt(enterYear); i < Integer.parseInt(enterLastYear); i += 4){
if(i % 400 == 0 || i % 4 == 0) {
JOptionPane.showMessageDialog(null, i + "\n");
}
}
} else {
JOptionPane.showMessageDialog(null, "Error: Starting Year is greater than Ending Year!");
}
}
}
You Simply need to build the message before passing it to the JOptionPane.
Sample Code:
public class LeapYearTest {
public static void main(String[] args) {
LeapYearTest leapYearTest = new LeapYearTest();
leapYearTest.showLeapYears(2000, 2020);
leapYearTest.showLeapYears(2000, 2000);
}
private void showLeapYears(int start, int end) {
StringBuffer msg = new StringBuffer();
if (start < end) {
msg.append("<html><table><tr><td><b>Leap Years</b></td></tr>");
for (int i = start; i < end; i++) {
if(i % 400 == 0 || i % 4 == 0) {
msg.append("<tr><td>" + i + "</td></tr>");
}
}
msg.append("</table></html>");
} else {
msg.append("Error: Starting Year is greater than Ending Year!");
}
JOptionPane.showMessageDialog(null, msg.toString());
}
}
Outputs:
I think you should replace i += 4 with i++. Also correct formula for leap year is
year % 4 == 0 && year % 100 != 0 || year % 400 == 0
I guess you can apply this logic
public void calculateLeapYears(int fromYear,int tillYear){
int count=0;
int firstLeapYear;
if(fromYear% 4==0)
firstLeapYear=fromYear;
else
firstLeapYear=fromYear+(4-fromYear%4);
for(int i=firstLeapYear;i<=tillYear;i+=4)
count++;
System.out.println(count);
}