Coding_knowledge

bookID = JOptionPane.showInputDialog(this, "Enter book ID to edit:"); for (int i = 0; i < books.size(); i++) { if (books.get(i)[0].equals(bookID)) { String[] book = new String[7]; book[0] = bookID; book[1] = textField2.getText(); book[2] = textField3.getText(); book[3] = textField4.getText(); book[4] = textField5.getText(); book[5] = textField6.getText(); book[6] = textField7.getText(); books.set(i, book); JOptionPane.showMessageDialog(this, "Book edited successfully"); clearFields(); return; } } JOptionPane.showMessageDialog(this, "Book not found"); } else if (e.getSource() == deleteButton) { String bookID = JOptionPane.showInputDialog(this, "Enter book ID to delete:"); for (int i = 0; i < books.size(); i++) { if (books.get(i)[0].equals(bookID)) { books.remove(i); JOptionPane.showMessageDialog(this, "Book deleted successfully"); clearFields(); return; } } JOptionPane.showMessageDialog(this, "Book not found"); } else if (e.getSource() == clearButton) { clearFields(); } else if (e.getSource() == exitButton) { System.exit(0); } } private void clearFields() { textField1.setText(""); textField2.setText(""); textField3.setText(""); textField4.setText(""); textField5.setText(""); textField6.setText(""); textField7.setText(""); } public static void main(String[] args) { new Library_management(); } }

import javax.swing.*; import java.awt.*; import java.awt.event.*; import java.util.*; public class Library_management extends JFrame implements ActionListener { private JLabel label1, label2, label3, label4, label5, label6, label7; private JTextField textField1, textField2, textField3, textField4, textField5, textField6, textField7; private JButton addButton, viewButton, editButton, deleteButton, clearButton,exitButton; private JPanel panel; private ArrayList books = new ArrayList(); public Library_management() { setTitle("Library Management System"); setSize(600, 300); setDefaultCloseOperation(EXIT_ON_CLOSE); label1 = new JLabel("Book ID"); label2 = new JLabel("Book Title"); label3 = new JLabel("Author"); label4 = new JLabel("Publisher"); label5 = new JLabel("Year of Publication"); label6 = new JLabel("ISBN"); label7 = new JLabel("Number of Copies"); textField1 = new JTextField(10); textField2 = new JTextField(20); textField3 = new JTextField(20); textField4 = new JTextField(20); textField5 = new JTextField(10); textField6 = new JTextField(20); textField7 = new JTextField(10); addButton = new JButton("Add"); viewButton = new JButton("View"); editButton = new JButton("Edit"); deleteButton = new JButton("Delete"); clearButton = new JButton("Clear"); exitButton=new JButton("Exit"); addButton.addActionListener(this); viewButton.addActionListener(this); editButton.addActionListener(this); deleteButton.addActionListener(this); clearButton.addActionListener(this); exitButton.addActionListener(this); panel = new JPanel(new GridLayout(10,2)); panel.add(label1); panel.add(textField1); panel.add(label2); panel.add(textField2); panel.add(label3); panel.add(textField3); panel.add(label4); panel.add(textField4); panel.add(label5); panel.add(textField5); panel.add(label6); panel.add(textField6); panel.add(label7); panel.add(textField7); panel.add(addButton); panel.add(viewButton); panel.add(editButton); panel.add(deleteButton); panel.add(clearButton); panel.add(exitButton); add(panel); setVisible(true); } public void actionPerformed(ActionEvent e) { if (e.getSource() == addButton) { String[] book = new String[7]; book[0] = textField1.getText(); book[1] = textField2.getText(); book[2] = textField3.getText(); book[3] = textField4.getText(); book[4] = textField5.getText(); book[5] = textField6.getText(); book[6] = textField7.getText(); books.add(book); JOptionPane.showMessageDialog(this, "Book added successfully"); clearFields(); } else if (e.getSource() == viewButton) { String[] columns = {"Book ID", "Book Title", "Author", "Publisher", "Year of Publication", "ISBN", "Number of Copies"}; Object[][] data = new Object[books.size()][7]; for (int i = 0; i < books.size(); i++) { data[i][0] = books.get(i)[0]; data[i][1] = books.get(i)[1]; data[i][2] = books.get(i)[2]; data[i][3] = books.get(i)[3]; data[i][4] = books.get(i)[4]; data[i][5] = books.get(i)[5]; data[i][6] = books.get(i)[6]; } JTable table = new JTable(data, columns); JScrollPane scrollPane = new JScrollPane(table); JFrame frame = new JFrame("View Books"); frame.add(scrollPane); frame.setSize(800, 400); frame.setVisible(true); } else if (e.getSource() == editButton) { String

Code to Generate the Map of India How does it work? Basically, the string is a run-length encoding of the map of India. Alternating characters in the string store how many times to draw space, and how many times to draw an exclamation mark consecutively. Here is an analysis of the different elements of this program – The encoded string "TFy!QJu ROo TNn(ROo)SLq SLq ULo+UHs UJq TNn*RPn/QPbEWS_JSWQAIJO^NBELPeHBFHT}TnALVlBL" "OFAkHFOuFETpHCStHAUFAgcEAelclcn^r^r\\tZvYxXyT|S~Pn SPm SOn TNn ULo0ULo#ULo-WHq!WFs XDt!"; Notice [b+++21] at the end of the encoded string. As b+++21 is equivalent to (b++ + 21) which will evaluate to 31 (10 + 21), the first 31 characters of this string are ignored and do not contribute to anything. The remaining encoded string contains instructions for drawing the map. The individual characters determine how many spaces or exclamation marks to draw consecutively. Outer for loop: This loop goes over the characters in the string. Each iteration increases the value of b by one and assigns the next character in the string to a. Inner for loop: This loop draws individual characters, and a new line whenever it reaches the end of the line. Consider this putchar statement putchar(++c=='Z' ? c = c/9 : 33^b&1); As ‘Z’ represents the number 90 in ASCII, 90/9 will give us 10 which is a newline character. Decimal 33 is ASCII for ‘!’. Toggling the low-order bit of 33 gives you 32, which is ASCII for a space. This causes! to be printed if b is odd, and a blank space to be printed if b is even. The algorithm implemented by this code is as follows: The algorithm implemented by this code is as follows: 1.Initialize three variables a, b, and c with values 10, 0, and 10 respectively. 2.Declare a character array str with a string of characters encoded by removing the first 31 characters of the original string. 3.Start a while loop that continues until a is 0. a. Read the next character in str by incrementing the value of b and assigning the character at the new index of str to a. b. Start another while loop that continues until a is less than or equal to 64. i. If c is equal to 90, reset c to 10 and print a newline character. ii. If c is not equal to 90, check if b is even or odd. 4.If b is even, print an exclamation mark. 5.If b is odd, print a space. 6.Increment c. 7.Decrement a. 8.Return 0. This algorithm decodes the encoded string in str and draws a map of India using spaces and exclamation marks. #include <iostream> int main() { int a = 10, b = 0, c = 10; char* str ="TFy!QJu ROo TNn(ROo)SLq SLq ULo+UHs UJq " "TNn*RPn/QPbEWS_JSWQAIJO^NBELPeHBFHT}TnALVlBL" "OFAkHFOuFETpHCStHAUFAgcEAelclcn^r^r\\tZvYxXyT|S~Pn SPm " "SOn TNn ULo0ULo#ULo-WHq!WFs XDt!"; while (a != 0) { a = str[b++]; while (a-- > 64) { if (++c == 90) { c = 10; // '\n' is 10 in ascii putchar('\n'); // or putchar(c); } else { if (b % 2 == 0) putchar('!'); else putchar(' '); } } } return 0; }

// Author coding_knowladge k; double sin(), cos(); main() { float A = 0, B = 0, i, j, z[1760]; char b[1760]; printf("\x1b[2J"); for (;;) { memset(b, 32, 1760); memset(z, 0, 7040); for (j = 0; 6.28 > j; j += 0.07) for (i = 0; 6.28 > i; i += 0.02) { float c = sin(i), d = cos(j), e = sin(A), f = sin(j), g = cos(A), h = d + 2, D = 1 / (c * h * e + f * g + 5), l = cos(i), m = cos(B), n = s\ in(B), t = c * h * g - f * e; int x = 40 + 30 * D * (l * h * m - t * n), y = 12 + 15 * D * (l * h * n + t * m), o = x + 80 * y, N = 8 * ((f * e - c * d * g) * m - c * d * e - f * g - l * d * n); if (22 > y && y > 0 && x > 0 && 80 > x && D > z[o]) { z[o] = D; ; ; b[o] = ".,-~:;=!*#$@"[N > 0 ? N : 0]; } } /*#****!!-*/ printf("\x1b[H"); for (k = 0; 1761 > k; k++) putchar(k % 80 ? b[k] : 10); A += 0.04; B += 0.02; } }

Digital Clock Using Java Swing code 👆👆

import java.awt.BorderLayout; import java.awt.Color; import java.awt.Font; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.text.SimpleDateFormat; import java.util.Calendar; import javax.swing.BorderFactory; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.JPanel; import javax.swing.SwingConstants; import javax.swing.Timer; public class Digital_clock extends JFrame { private JLabel timeLabel; private JLabel dateLabel; public Digital_clock() { setTitle("Digital Clock"); setSize(500, 200); setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); setResizable(false); // Create a panel to hold the time and date labels JPanel panel = new JPanel(); panel.setBorder (BorderFactory.createEmptyBorder(20,20,20,20)); panel.setLayout(new BorderLayout()); // Create a label to display the time timeLabel = new JLabel(); timeLabel.setFont(new Font("Arial", Font.PLAIN, 60)); timeLabel.setHorizontalAlignment(SwingConstants.CENTER); timeLabel.setVerticalAlignment(SwingConstants.CENTER); timeLabel.setForeground(Color.red); // Create a label to display the date dateLabel = new JLabel(); dateLabel.setFont(new Font("Arial", Font.PLAIN, 20)); dateLabel.setHorizontalAlignment(SwingConstants.CENTER); dateLabel.setVerticalAlignment(SwingConstants.CENTER); dateLabel.setForeground(Color.red); // Add the time and date labels to the panel panel.add(timeLabel, BorderLayout.CENTER); panel.add(dateLabel, BorderLayout.SOUTH); // Set the panel's background color panel.setBackground(Color.BLACK); // Add the panel to the frame add(panel); /* Use a Timer to update the time and date labels every second */ Timer timer = new Timer(1000, new ActionListener() { @Override public void actionPerformed(ActionEvent e) { updateTimeAndDate(); } }); timer.start(); } private void updateTimeAndDate() { // Get the current time and format it Calendar calendar = Calendar.getInstance(); SimpleDateFormat timeFormatter = new SimpleDateFormat("HH:mm:ss"); String time=timeFormatter.format(calendar.getTime()); // Get the current date and format it SimpleDateFormat dateFormatter = new SimpleDateFormat("EEE, MMM dd, yyyy"); String date= dateFormatter.format(calendar.getTime()); // Update the time and date labels timeLabel.setText(time); dateLabel.setText(date); } public static void main(String[] args) { Digital_clock clock = new Digital_clock(); clock.setVisible(true); } }

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