I'd like to add Ladder by the number of counts. How do I get the numbers in and work smoothly?
public void NumOutbox_TextChanged(object sender, TextChangedEventArgs e)
{
var temp = NumOutbox.Text;
if (int.TryParse(temp, out int result))
{
if (result >= startBox.SetBoxMIN && result <= startBox.SetBoxMAX)
{
ChangeColumn(result);
}
else
{
NumOutbox.Text = "2";
}
}
else
{ .
MessageBox.Show("숫자를 입력해주세요 \nPlease enter a number");
}
}
private void ChangeColumn(int count)
{
// I want to have Ladder as many as the count, but I don't know how.
// LadderSet ladder = new LadderSet();
// Ladders.Children.Add(ladder);
}
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All right, so I have this program based where I want to print a receipt from a dentists office. As it is right now, you enter a number and the cost will print accordingly. However, I would like to able to enter multiple numbers in the program and when I type "-1" I want the program to stop and print the total cost. Take a look:
import java.util.Scanner;
public class DentistReception{
public static void main(String[] args) {
double cost = 0;
int treatment = 0;
final double checkUp = 60.00;
final double cleaning = 30.00;
final double cavity = 150.00;
Scanner input = new Scanner(System.in);
System.out.println("What service(s) will be done?: ");
System.out.println("Checkup: 1");
System.out.println("Cleaning: 2");
System.out.println("Cavity: 3");
System.out.println("Exit: -1");
treatment = input.nextInt();
{
if (treatment == 1) {
cost = cost + checkUp;
}
else {
if (treatment == 2) {
cost = cost + cleaning;
}
else {
if (treatment == 3) {
cost = cost + cavity;
}
else {
while (treatment < 0) break;
}
}
}
}
System.out.println("Total cost it:"+cost);
}
}
I want it to loop until i enter "-1", but the break doesn't seem like it wants to. Whenever I put the while or break somewhere else I get the message "break without loop" or something like that.
Use while and capture the option with a boolean variable
import java.util.Scanner;
public class Test {
public static void main(String[] args) {
double cost = 0;
int treatment = 0;
final double checkUp = 60.00;
final double cleaning = 30.00;
final double cavity = 150.00;
boolean repeat = true;
while (repeat) {
Scanner input = new Scanner(System.in);
System.out.println("What service(s) will be done?: ");
System.out.println("Checkup: 1");
System.out.println("Cleaning: 2");
System.out.println("Cavity: 3");
System.out.println("Exit: -1");
treatment = input.nextInt();
input.nextLine();
switch (treatment) {
case 1:
cost = cost + checkUp;
break;
case 2:
cost = cost + cleaning;
break;
case 3:
cost = cost + cavity;
break;
default:
System.out.println("do you want to break out the loop?");
String ans = input.nextLine();
if (ans.equals("y")){
System.out.println("exiting...");
repeat = false;
}
break;
}
// if (treatment == 1) {
// cost = cost + checkUp;
// } else {
// if (treatment == 2) {
// cost = cost + cleaning;
// } else {
// if (treatment == 3) {
// cost = cost + cavity;
// } else {
// while (treatment < 0)
// break;
// }
// }
// }
}
System.out.println("Total cost it:" + cost);
}
}
I'm trying to make a very simple game where the yellow ball bouncing back and fourth. If it collides with one of the moving blue squares, the square is supposed to disappear and a new one should appear (always 3 in the window) elsewhere. When my code reaches this part, all 3 squares disappear (then reappears as intended it is not a problem) and I just cant figure out why. It would be a huge help if somebody could run over my methods responsible for the problem. Thank you in advance.
So my timer_Tick method, responsible for every frame:
void timer_Tick(object sender, EventArgs e)
{
logic.MoveBall();
if (model.Enemy.Count<3)
{
logic.AddEnemy();
}
int iii = 0;
foreach (MyShape enemy in model.Enemy) //the whole thing from here is me trying to solve list modification during iteration
{
if (logic.MoveEnemy(enemy) == -1)
{
logic.MoveEnemy(enemy);
}
else iii = logic.MoveEnemy(enemy);
}
if (iii > -1)
{
for (int j = model.Enemy.Count - 1; j >= 0; j--)
{
if (j == model.Enemy.Count - iii)
{
model.Enemy.RemoveAt(j);
}
}
}
}
MoveEnemy: I try to decide whether there is collusion and if yes, then try to remove the given shape object (blue square). Because This whole method is in a foreach, I just save the removable element and forward it to timer_Tick
public int MoveEnemy(MyShape shape)
{
int i = 0;
int ii = -1;
if ((shape.Area.IntersectsWith(model.Ball.Area)))
{
i = 0;
foreach (var e in model.Enemy)
{
i++;
if (shape == e)
{
ii = i;
}
}
}
shape.ChangeX(shape.Dx);
shape.ChangeY(shape.Dy);
bool coll = false;
foreach (var e in model.Enemy)
{
if ((e.Area.IntersectsWith(shape.Area)) && (shape != e))
{
coll = true;
}
}
if (shape.Area.Left < 0 || shape.Area.Right > Config.Width-40 || coll)
{
shape.Dx = -shape.Dx;
}
if (shape.Area.Top < 0)
{
shape.Dy = -shape.Dy;
}
if (shape.Area.Bottom > Config.Height/2)
{
shape.Dy = -shape.Dy;
}
RefreshScreen?.Invoke(this, EventArgs.Empty);
return ii;
}
And finally AddEnemy:
public void AddEnemy()
{
rnd = new Random();
int r = rnd.Next(-300, 300);
model.Enemy.Add(new MyShape(Config.Width / 2+r, 0, 40, 40));
RefreshScreen?.Invoke(this, EventArgs.Empty);
}
List<T> (or IList and Enumerable) exposes some useful methods to compact code:
int itemIndex = list.IndexOf(item); // Gets the index of the item if found, otherwise returns -1
list.Remove(item); // Remove item if contained in collection
list.RemoveAll(item => item > 5); // Removes all items that satisfy a condition (replaces explicit iteration)
bool hasAnyMatch = list.Any(item => item > 5); // Returns true as soon as the first item satisfies the condition (replaces explicit iteration)
A simplified version, which should eliminate the flaw:
void timer_Tick(object sender, EventArgs e)
{
if (model.Enemy.Count < 3)
{
logic.AddEnemy();
}
logic.MoveBall();
model.Enemy.ForeEach(logic.MoveEnemy);
model.Enemy.RemoveAll(logic.IsCollidingWithBall);
}
public void AddEnemy()
{
rnd = new Random();
int r = rnd.Next(-300, 300);
model.Enemy.Add(new MyShape(Config.Width / 2 + r, 0, 40, 40));
RefreshScreen?.Invoke(this, EventArgs.Empty);
}
public bool IsCollidingWithBall(MyShape shape)
{
return shape.Area.IntersectsWith(model.Ball.Area);
}
public int MoveEnemy(MyShape shape)
{
shape.ChangeX(shape.Dx);
shape.ChangeY(shape.Dy);
bool hasCollision = model.Enemy.Any(enemy => enemy.Area.IntersectsWith(shape.Area)
&& enemy != shape);
if (hasCollision || shape.Area.Left < 0 || shape.Area.Right > Config.Width - 40)
{
shape.Dx = -shape.Dx;
}
if (shape.Area.Top < 0)
{
shape.Dy = -shape.Dy;
}
if (shape.Area.Bottom > Config.Height / 2)
{
shape.Dy = -shape.Dy;
}
RefreshScreen?.Invoke(this, EventArgs.Empty);
}
I'd like to pass a generated array (arNum[20]) from Form number 1(MyForm.h) to Form number 2(MyForm1.h) in the following function
private: System::Void button1_Click(System::Object^ sender, System::EventArgs^ e) {
int x;
int arNum[20];
if (!int::TryParse(txtNodes->Text, x))
MessageBox::Show("First box wasn't an integer");
else
{
for (int i = 0; i < txtNumbers->Text->Length; i+=2)
{
if (!(int)txtNumbers->Text[i])
{
MessageBox::Show("Invalid Input!");
return;
}
else
{
arNum[i] = (int)txtNumbers->Text[i];
}
}
MessageBox::Show("Data submitted correctly.");
MyForm1 ^form = gcnew MyForm1();
form->
}
}
Thanks.
SORRY ABOUT FORMATTING. i am trying to determine if the grade is a passing, failing, or invalid grade. however i can't figure out how to catch the error.
EDIT: 70-100 OR "s" or "S" = pass; 0-69 OR u or U = retake; everything else = invalid.
This is my code:
import java.util.*;
public class Demo
{
public static void main(String [] args)
{
Scanner kb = new Scanner(System.in);
String total="";
System.out.println("enter grade");
total = kb.nextLine();
System.out.println(evaluateGrade(total));
}
public static String evaluateGrade(String expr)
{
String result ="";
boolean invalid = false;
int grade = Integer.parseInt(expr);
try{
if((grade <100 && grade >=70) || (expr.equalsIgnoreCase("s"))
{
result ="pass";
}
else if((grade <70 && grade >0)|| expr.equalsIgnoreCase("u"))
{
result ="retake";
}
else
{result="invalid";
}
} catch (Exception e)
{
}
return result;
}
}
This is my code:
import java.util.*;
class Demo{
public static void main(String [] args){
Scanner kb = new Scanner(System.in);
System.out.println("enter grade");
System.out.println(evaluateGrade(kb.next()));
kb.close(); // You need to ".close" your stuff
}
public static String evaluateGrade(String expr){
String result ="";
// boolean invalid = false; <--- This is not necessary
if(expr.equalsIgnoreCase("s")){
return "pass";
}
if(expr.equalsIgnoreCase("u")){
return "retake";
}
try{ // Try to get a Integer on "grade"
Integer grade = Integer.valueOf(expr);
if( (grade <= 100 && grade >=70)){ // 70 <= grade <= 100, and you forgot the ')'
result ="pass";
}
else if((grade <70 && grade >=0)){ // 0 <= grade < 70
result ="retake";
}
else{
result="invalid";
}
}
catch(NumberFormatException e){ // If "grade" is not a number, then you have this line
System.err.println("Your grade must be a NUMBER between 0 and 100.");
return "invalid"; // Return something to keep going with your code
}
return result;
}
}
If you're not understanding what is happening with your code, write it down on the paper.
Have a good day!
I am trying to find out in a richtext box whether the caret is position in the last line. Is this possible?
NOTE: At the end I also added: or count how many lines it has, this is because in the miscrosoft forum there is an example for detecting in which line the caret is.
thanks
Please verify the msdn link
http://social.msdn.microsoft.com/Forums/en/wpf/thread/667b5d2a-84c3-4bc0-a6c0-33f9933db07f
If you really wanted to know the line number of the caret, you could do something like the following (probably needs some tweaking):
TextPointer caretLineStart = rtb.CaretPosition.GetLineStartPosition(0);
TextPointer p = rtb.Document.ContentStart.GetLineStartPosition(0);
int caretLineNumber = 1;
while (true)
{
if (caretLineStart.CompareTo(p) < 0)
{
break;
}
int result;
p = p.GetLineStartPosition(1, out result);
if (result == 0)
{
break;
}
caretLineNumber++;
}
The code to get the number of lines:
Int32 CountDisplayedLines(RichTextBox rtb)
{
Int32 result = -1;
rtb.CaretPosition = rtb.Document.ContentStart;
while (rtb.CaretPosition.GetLineStartPosition(++result) != null)
{
}
return result;
}
I have found a solution. Maybe there is a simpler way, if so please let me know
private void OnHasRtbReachedEnd(System.Windows.Controls.RichTextBox rtb)
{
TextPointer pointer1 = rtb.CaretPosition;
int iCurrentLine = GetLineNumber(rtb);
rtb.CaretPosition = rtb.Document.ContentEnd;
int iLastLine = GetLineNumber(rtb);
if (iCurrentLine == iLastLine)
{
if (!_bIsRtbMovingUpDown)
MoveToNextDataGridRow();
_bIsRtbMovingUpDown= false;
}
else
{
_bIsRtbMovingUpDown= true;
}
rtb.CaretPosition = pointer1;
}
//This code comes from
//http://social.msdn.microsoft.com/Forums/en/wpf/thread/667b5d2a-84c3-4bc0-a6c0-33f9933db07f
private int GetLineNumber(System.Windows.Controls.RichTextBox rtb)
{
TextPointer caretLineStart = rtb.CaretPosition.GetLineStartPosition(0);
TextPointer p = rtb.Document.ContentStart.GetLineStartPosition(0);
int caretLineNumber = 1;
while (true)
{
if (caretLineStart.CompareTo(p) < 0)
{
break;
}
int result;
p = p.GetLineStartPosition(1, out result);
if (result == 0)
{
break;
}
caretLineNumber++;
}
return caretLineNumber;
}
I tried the code and is not giving correct results always.
One smart way to do it is this
int previousCursorPosition;
private void RichTarget_KeyDown_1(object sender, KeyEventArgs e)
{
if (e.Key == Key.Up || e.Key == Key.Down)
{
Xceed.Wpf.Toolkit.RichTextBox rich = (Xceed.Wpf.Toolkit.RichTextBox)sender;
previousCursorPosition = rich.CaretPosition.GetOffsetToPosition(rich.CaretPosition.DocumentStart);
}
}
private void RichTextBox_KeyUp_1(object sender, KeyEventArgs e)
{
if (e.Key == Key.Up)
{
Xceed.Wpf.Toolkit.RichTextBox rich = (Xceed.Wpf.Toolkit.RichTextBox)sender;
if (previousCursorPosition == rich.CaretPosition.GetOffsetToPosition(rich.CaretPosition.DocumentStart))
{
//do your staff
}
}
else if (e.Key == Key.Down)
{
Xceed.Wpf.Toolkit.RichTextBox rich = (Xceed.Wpf.Toolkit.RichTextBox)sender;
if (previousCursorPosition == rich.CaretPosition.GetOffsetToPosition(rich.CaretPosition.DocumentStart))
{
//do your staff
}
}
}