P U MANJULA

Manjula/Calculator/Calculator

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+import java.util.Scanner;
+
+public class Calculator {
+
+    public static void main(String[] args) {
+        Scanner scanner = new Scanner(System.in);
+
+        System.out.print("Enter the first number: ");
+        double num1 = scanner.nextDouble();
+
+        System.out.print("Enter an operator (+, -, *, /): ");
+        char operator = scanner.next().charAt(0);
+
+        System.out.print("Enter the second number: ");
+        double num2 = scanner.nextDouble();
+
+        double result = calculate(num1, operator, num2);
+
+        if (Double.isNaN(result)) {
+            System.out.println("Error: Invalid operator or division by zero.");
+        } else {
+            System.out.println("The result is: " + result);
+        }
+    }
+
+    public static double calculate(double num1, char operator, double num2) {
+        switch (operator) {
+            case '+':
+                return num1 + num2;
+            case '-':
+                return num1 - num2;
+            case '*':
+                return num1 * num2;
+            case '/':
+                if (num2 == 0) {
+                    return Double.NaN; // Not a number
+                } else {
+                    return num1 / num2;
+                }
+            default:
+                return Double.NaN;
+        }
+    }
+}

Manjula/NumberGuessingGame

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+import java.util.Random;
+import java.util.Scanner;
+
+public class NumberGuessingGame {
+    public static void main(String[] args) {
+        Scanner scanner = new Scanner(System.in);
+        Random random = new Random();
+
+        int lowerBound = 1;
+        int upperBound = 100; // You can adjust this range as per your preference
+        int targetNumber = random.nextInt(upperBound - lowerBound + 1) + lowerBound;
+
+        System.out.println("Welcome to the Number Guessing Game!");
+        System.out.println("I have selected a number between " + lowerBound + " and " + upperBound + ". Guess what it is!");
+
+        int attempts = 0;
+        boolean hasGuessedCorrectly = false;
+        int maxAttempts = 7; // You can adjust the maximum number of attempts here
+
+        while (attempts < maxAttempts) {
+            System.out.print("Enter your guess: ");
+            int guess = scanner.nextInt();
+            attempts++;
+
+            if (guess < targetNumber) {
+                System.out.println("Too low! Try again.");
+            } else if (guess > targetNumber) {
+                System.out.println("Too high! Try again.");
+            } else {
+                hasGuessedCorrectly = true;
+                break;
+            }
+        }
+
+        if (hasGuessedCorrectly) {
+            System.out.println("Congratulations! You guessed the number " + targetNumber + " correctly in " + attempts + " attempts!");
+        } else {
+            System.out.println("Sorry, you've used all your attempts. The number was: " + targetNumber);
+        }
+
+        scanner.close();
+    }
+}

Manjula/TemperatureConverter/TemperatureConverter

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+import java.util.Scanner;
+
+public class TemperatureConverter {
+
+    public static double celsiusToFahrenheit(double celsius) {
+        return (celsius * 9 / 5) + 32;
+    }
+
+    public static double fahrenheitToCelsius(double fahrenheit) {
+        return (fahrenheit - 32) * 5 / 9;
+    }
+
+    public static double celsiusToKelvin(double celsius) {
+        return celsius + 273.15;
+    }
+
+    public static double kelvinToCelsius(double kelvin) {
+        return kelvin - 273.15;
+    }
+
+    public static double fahrenheitToKelvin(double fahrenheit) {
+        return (fahrenheit + 459.67) * 5 / 9;
+    }
+
+    public static double kelvinToFahrenheit(double kelvin) {
+        return kelvin * 9 / 5 - 459.67;
+    }
+
+    public static void main(String[] args) {
+        Scanner scanner = new Scanner(System.in);
+
+        System.out.println("Temperature Converter");
+        System.out.println("1. Celsius to Fahrenheit");
+        System.out.println("2. Fahrenheit to Celsius");
+        System.out.println("3. Celsius to Kelvin");
+        System.out.println("4. Kelvin to Celsius");
+        System.out.println("5. Fahrenheit to Kelvin");
+        System.out.println("6. Kelvin to Fahrenheit");
+        System.out.print("Choose conversion (1-6): ");
+
+        int choice = scanner.nextInt();
+
+        double inputTemp, resultTemp;
+
+        switch(choice) {
+            case 1:
+                System.out.print("Enter temperature in Celsius: ");
+                inputTemp = scanner.nextDouble();
+                resultTemp = celsiusToFahrenheit(inputTemp);
+                System.out.println("Temperature in Fahrenheit: " + resultTemp);
+                break;
+            case 2:
+                System.out.print("Enter temperature in Fahrenheit: ");
+                inputTemp = scanner.nextDouble();
+                resultTemp = fahrenheitToCelsius(inputTemp);
+                System.out.println("Temperature in Celsius: " + resultTemp);
+                break;
+            case 3:
+                System.out.print("Enter temperature in Celsius: ");
+                inputTemp = scanner.nextDouble();
+                resultTemp = celsiusToKelvin(inputTemp);
+                System.out.println("Temperature in Kelvin: " + resultTemp);
+                break;
+            case 4:
+                System.out.print("Enter temperature in Kelvin: ");
+                inputTemp = scanner.nextDouble();
+                resultTemp = kelvinToCelsius(inputTemp);
+                System.out.println("Temperature in Celsius: " + resultTemp);
+                break;
+            case 5:
+                System.out.print("Enter temperature in Fahrenheit: ");
+                inputTemp = scanner.nextDouble();
+                resultTemp = fahrenheitToKelvin(inputTemp);
+                System.out.println("Temperature in Kelvin: " + resultTemp);
+                break;
+            case 6:
+                System.out.print("Enter temperature in Kelvin: ");
+                inputTemp = scanner.nextDouble();
+                resultTemp = kelvinToFahrenheit(inputTemp);
+                System.out.println("Temperature in Fahrenheit: " + resultTemp);
+                break;
+            default:
+                System.out.println("Invalid choice.");
+        }
+
+        scanner.close();
+    }
+}

Manjula/ToDoList/Todolist

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+import java.util.ArrayList;
+import java.util.Scanner;
+
+public class TaskManager {
+    private static ArrayList<String> tasks = new ArrayList<>();
+
+    public static void main(String[] args) {
+        Scanner scanner = new Scanner(System.in);
+        boolean exit = false;
+
+        while (!exit) {
+            System.out.println("Task Manager");
+            System.out.println("1. Add Task");
+            System.out.println("2. Delete Task");
+            System.out.println("3. Mark Task as Completed");
+            System.out.println("4. View Tasks");
+            System.out.println("5. Exit");
+            System.out.print("Enter your choice: ");
+            int choice = scanner.nextInt();
+            scanner.nextLine(); // Consume newline character
+
+            switch (choice) {
+                case 1:
+                    System.out.print("Enter task to add: ");
+                    String taskToAdd = scanner.nextLine();
+                    addTask(taskToAdd);
+                    break;
+                case 2:
+                    System.out.print("Enter index of task to delete: ");
+                    int indexToDelete = scanner.nextInt();
+                    scanner.nextLine(); // Consume newline character
+                    deleteTask(indexToDelete);
+                    break;
+                case 3:
+                    System.out.print("Enter index of task to mark as completed: ");
+                    int indexToComplete = scanner.nextInt();
+                    scanner.nextLine(); // Consume newline character
+                    markTaskAsCompleted(indexToComplete);
+                    break;
+                case 4:
+                    viewTasks();
+                    break;
+                case 5:
+                    exit = true;
+                    System.out.println("Exiting...");
+                    break;
+                default:
+                    System.out.println("Invalid choice. Please enter a number between 1 and 5.");
+            }
+        }
+
+        scanner.close();
+    }
+
+    private static void addTask(String task) {
+        tasks.add(task);
+        System.out.println("Task added successfully.");
+    }
+
+    private static void deleteTask(int index) {
+        if (index >= 0 && index < tasks.size()) {
+            tasks.remove(index);
+            System.out.println("Task deleted successfully.");
+        } else {
+            System.out.println("Invalid index. No task deleted.");
+        }
+    }
+
+    private static void markTaskAsCompleted(int index) {
+        if (index >= 0 && index < tasks.size()) {
+            String task = tasks.get(index);
+            tasks.set(index, "[Completed] " + task);
+            System.out.println("Task marked as completed.");
+        } else {
+            System.out.println("Invalid index. No task marked as completed.");
+        }
+    }
+
+    private static void viewTasks() {
+        if (tasks.isEmpty()) {
+            System.out.println("No tasks found.");
+        } else {
+            System.out.println("Tasks:");
+            for (int i = 0; i < tasks.size(); i++) {
+                System.out.println(i + ". " + tasks.get(i));
+            }
+        }
+    }
+}