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Use two for loops simultaneously


Use two for loops simultaneously

By : Vidadi GencEli
Date : October 28 2020, 08:00 PM
around this issue The zip() builtin will do what you want, combining lists that have corresponding elements.
code :
>>> names = 'n1 n2 n3 n4'.split()
>>> castes = 'c1 c2 c3 c4'.split()
>>> pprint.pprint(list(zip(names, castes)), width=20)
[('n1', 'c1'),
 ('n2', 'c2'),
 ('n3', 'c3'),
 ('n4', 'c4')]
for name, caste in zip(names, castes):
    print('Hello', name.title(), caste.title())
names = 'n1 n2 n3 n4'.split()
castes = 'c1 c2 c3 c4'.split()
towns = 't1 t2 t3 t4'.split()
for name, caste, town in zip(names, castes, towns):
    print(f'{name} ({caste}) lives in {town}.')


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How can I run two loops simultaneously - C++?

How can I run two loops simultaneously - C++?


By : Biscuit
Date : March 29 2020, 07:55 AM
I think the issue was by ths following , Since this is almost certainly a homework, here is an explanation of the approach with no code.
You do not need two loops, you need two loop variables. Start the first one at the beginning of the word, and the second one at the end, compare the characters at loop indexes, and return false if they are different. If the characters are the same, move to the next iteration by advancing the front index forward and the back index backward. Stop when the front index is equal to or greater than the back index.
code :
for (int front = 0, back = s.size() ; front < back ; front++, back--) ...
How to repeat loops simultaneously

How to repeat loops simultaneously


By : deep
Date : March 29 2020, 07:55 AM
it should still fix some issue Let's talk about what's wrong...
AWT (and Swing) use a single thread, known as the Event Dispatching Thread (AKA EDT) which is responsible for processing user input (like mouse and keyboard events), system events (like changes to the components internally and externally (coming from the OS)) and, most importantly for this issue, paint requests.
code :
private int x = 0;
private int y = 0;

private Thread t;
private volatile boolean keepRunning;

@Override
public void init()
{
    setBackground(Color.BLACK); 
}

@Override
public void start() 
{
    keepRunning = true;
    t = new Thread(new Runnable() {
        private boolean state = false;
        public void run() {
            while (keepRunning) {
                if (state) {
                    setForeground(Color.BLACK);
                } else {
                    x = (int)(Math.random()*495+1);
                    y = (int)(Math.random()*200+1);
                    setForeground(Color.WHITE);
                }
                state = !state;
                repaint();
                try {
                    Thread.sleep(500);
                } catch(InterruptedException ex) {
                    keepRunning = false;
                }
            }
        }
    });    
}

@Override
public void stop() {
    keepRunning = false;
}

@Override
public void paint(Graphics g)
{
    super.paint(g);
    g.setColor(getForeground());
    g.fillOval(x,y,5,5);
}
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JApplet;
import javax.swing.JPanel;
import javax.swing.Timer;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;

public class RandomApplet extends JApplet {

    private RandomPane randomPane;
    private Timer timer;

    public RandomApplet() {
        try {
            UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
        } catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
            ex.printStackTrace();
        }
    }

    @Override
    public void init() {
        EventQueue.invokeLater(new Runnable() {
            @Override
            public void run() {
                setLayout(new BorderLayout());
                randomPane = new RandomPane();
                add(randomPane);
            }
        });
    }

    @Override
    public void start() {
        EventQueue.invokeLater(new Runnable() {
            @Override
            public void run() {
                // Just want to make sure that the timer is not started before the
                // UI is initalised...
                if (timer != null && timer.isRunning()) {
                    timer.stop();
                }
                timer = new Timer(500, new ActionListener() {
                    private boolean state = false;

                    @Override
                    public void actionPerformed(ActionEvent e) {
                        if (state) {
                            randomPane.setForeground(Color.BLACK);
                        } else {
                            randomPane.randomise();
                            randomPane.setForeground(Color.WHITE);
                        }
                        state = !state;
                        repaint();
                    }
                });
                timer.start();
            }
        });
    }

    @Override
    public void stop() {
        timer.stop();
    }

    public class RandomPane extends JPanel {

        private int xPos;
        private int yPos;

        public RandomPane() {
            setBackground(Color.BLACK);
            setForeground(Color.BLACK);
        }

        @Override
        public Dimension getPreferredSize() {
            return new Dimension(495, 200);
        }

        @Override
        protected void paintComponent(Graphics g) {
            super.paintComponent(g);
            Graphics2D g2d = (Graphics2D) g.create();
      g2d.setColor(getForeground());
      g2d.fillOval(xPos, yPos, 5, 5);
            g2d.dispose();
        }

        public void randomise() {
            xPos = (int) (Math.random() * (getWidth() - 5));
            yPos = (int) (Math.random() * (getHeight() - 5));
        }
    }
}
How do I run these two loops simultaneously? (Java)

How do I run these two loops simultaneously? (Java)


By : Eduardo Damián
Date : March 29 2020, 07:55 AM
help you fix your problem You are not using Threads correctly.
The logic should be in the run method.
code :
public void addMessage(String message) {
     synchronized(inputQueue) {
          inputQueue.offer(r);
          inputQueue.notify();
     }
}
public void run() {
        try {
            while(!running) 
                    synchronized (inputQueue) {
                        inputQueue.wait();  // you can have a timeout also...
                            String message = this.inputQueue.poll();
                              // use the message item....
                              // in your case send it to the other user.
                        }
                    }       
                }
        } catch (Exception e) {
            /////// your exception handler
        }
}
Thread t = new MyThread();
t.start(); /// Start the thread !!!
Queue<String>
Two loops simultaneously?

Two loops simultaneously?


By : astkaasa
Date : March 29 2020, 07:55 AM
I wish this helpful for you Sounds like you want two threads.
is it possible to run two for loops simultaneously?

is it possible to run two for loops simultaneously?


By : Alexey Ukhov
Date : March 29 2020, 07:55 AM
it fixes the issue Before you start worrying about running loops in parallel, worry about writing simple, correct code.
For instance:
code :
for(int i=0;i<n;i++){
    for(int j=0;j<n;j++){
        if(i==j){
            left=left+arr[i][j];
        }
    }
}
for(int i=0;i<n;i++){
  left += arr[i][i];
}
for(int i=0,int j=n;i<n;i++,j--){
    right=right+arr[i][j];
}
for(int i=0, j=n-1;i<n;i++, j--){
  left += arr[i][i];
  right += arr[i][j];
}
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