Swapping two numbers without third variable

C++/sumofnum_without_operator/readme.md

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+##  FIND SUM OF TWO NUMBERS WITHOUT USING ADDITION OPERATOR OR FUNCTION
+
+The following program has been written in ```C++``` :
+
+The program goes in a loop and stores the sum in one of the numbers, by using the increment operator.

C++/swap_without_temp/readme.md

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+## SWAP TWO NUMBERS WITHOUT USING TEMPORARY VARIABLE 
+
+The following program has been written in ```C++``` :
+
+The program first adds the two numbers and stores it in the first variable
+
+Then the numbers are subtracted and stored in the second variable 
+
+Finally, the numbers (with the updated values) are subtracted and stored in the first variable hence successfully swapping it

C++/swap_without_temp/swap_without_temp.cpp

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+// C++ Program to swap two numbers  without using temporary variable
+
+#include <bits/stdc++.h>
+using namespace std;
+
+int main()
+{
+    int a = 11, b = 6;
+
+    // Code to swap 'a' and 'b'
+    a = a + b; 
+    b = a - b; 
+    a = a - b; 
+    cout << "After Swapping: a =" << a << ", b=" << b;
+}

Java/Clock display/Clock.java

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+import java.awt.BasicStroke;
+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 java.awt.image.BufferedImage;
+import java.time.LocalTime;
+import java.time.temporal.TemporalField;
+import java.util.Date;
+import java.util.concurrent.TimeUnit;
+import javax.swing.JFrame;
+import javax.swing.JPanel;
+import javax.swing.Timer;
+import javax.swing.UIManager;
+import javax.swing.UnsupportedLookAndFeelException;
+
+public class Test 
+{
+
+    public static void main(String[] args) 
+    {
+        new Test();
+    }
+
+    public Test() 
+    {
+        EventQueue.invokeLater(new Runnable() 
+        {
+            @Override
+            public void run() 
+            {
+                try 
+                {
+                    UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
+                } catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) 
+                {
+                    ex.printStackTrace();
+                }
+
+                JFrame frame = new JFrame("Testing");
+                frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
+                frame.add(new ClockFace());
+                frame.pack();
+                frame.setLocationRelativeTo(null);
+                frame.setVisible(true);
+            }
+        });
+    }
+
+    public class ClockFace extends JPanel 
+    {
+
+        public ClockFace() 
+        {
+            this.startClock();
+        }
+
+        @Override
+        public Dimension getPreferredSize() 
+        {
+            return new Dimension(600, 600);
+        }
+
+        @Override
+        protected void paintComponent(Graphics g) 
+        {
+            Graphics2D g2d = (Graphics2D) g.create();
+
+            LocalTime now = LocalTime.now();
+            int seconds = now.getSecond();
+            int minutes = now.getMinute();
+            int hours = now.getHour();
+
+            g2d.setColor(Color.BLACK);
+            g2d.fillRect(0, 0, 600, 600);
+            g2d.setColor(Color.WHITE);
+            g2d.translate(300, 300);
+
+            //Drawing the hour markers
+            for (int i = 0; i < 12; i++) 
+            {
+
+                g2d.drawLine(0, -260, 0, -300);
+                g2d.rotate(Math.PI / 6);
+
+            }
+
+            g2d.rotate(seconds * Math.PI / 30);
+            g2d.drawLine(0, 0, 0, -290);
+
+            g2d.rotate(2 * Math.PI - seconds * Math.PI / 30);
+            g2d.rotate(minutes * Math.PI / 30);
+            g2d.setStroke(new BasicStroke(3));
+            g2d.drawLine(0, 0, 0, -250);
+
+            g2d.rotate(2 * Math.PI - minutes * Math.PI / 30);
+            g2d.rotate(hours * Math.PI / 6);
+            g2d.setStroke(new BasicStroke(6));
+            g2d.drawLine(0, 0, 0, -200);
+
+            g2d.dispose();
+        }
+
+        public void startClock() 
+        {
+            Timer timer = new Timer(500, new ActionListener() 
+            {
+                @Override
+                public void actionPerformed(ActionEvent e) 
+                {
+                    repaint();
+                }
+            });
+            timer.start();
+        }
+
+   }
+}

Java/Clock display/readme.md

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+This program creates a clock and displays it using java functions