Easy level Tasks

sai chukka/README.md

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+Task-1:about Simple Calculator
+
+Develop a basic calculator application capable of performing addition, subtraction, multiplication, and division operations.
+Task-2: about ToDo List
+
+Create a console-based or GUI application for managing a list of tasks with features like adding, deleting, and marking tasks as completed.
+Task-3: About Number Guessing Game
+
+Implement a simple number guessing game where the computer generates a random number and the player tries to guess it within a certain number of attempts.
+Task-4: about Temperature Converter
+
+Build an application that converts temperatures between Celsius, Fahrenheit, and Kelvin scales

sai chukka/Task-2

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+import java.util.ArrayList;
+import java.util.Scanner;
+
+class Task {
+    private String name;
+    private boolean completed;
+
+    public Task(String name) {
+        this.name = name;
+        this.completed = false;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public boolean isCompleted() {
+        return completed;
+    }
+
+    public void markCompleted() {
+        this.completed = true;
+    }
+}
+
+public class TaskManager {
+    private ArrayList<Task> tasks;
+    private Scanner scanner;
+
+    public TaskManager() {
+        tasks = new ArrayList<>();
+        scanner = new Scanner(System.in);
+    }
+
+    public void displayMenu() {
+        System.out.println("Task Manager Menu:");
+        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: ");
+    }
+
+    public void addTask(String taskName) {
+        Task task = new Task(taskName);
+        tasks.add(task);
+        System.out.println("Task added successfully!");
+    }
+
+    public void deleteTask(int index) {
+        if (index >= 0 && index < tasks.size()) {
+            tasks.remove(index);
+            System.out.println("Task deleted successfully!");
+        } else {
+            System.out.println("Invalid task index!");
+        }
+    }
+
+    public void markTaskCompleted(int index) {
+        if (index >= 0 && index < tasks.size()) {
+            tasks.get(index).markCompleted();
+            System.out.println("Task marked as completed!");
+        } else {
+            System.out.println("Invalid task index!");
+        }
+    }
+
+    public void viewTasks() {
+        System.out.println("Tasks:");
+        for (int i = 0; i < tasks.size(); i++) {
+            Task task = tasks.get(i);
+            System.out.println((i + 1) + ". " + task.getName() + " - Completed: " + task.isCompleted());
+        }
+    }
+
+    public static void main(String[] args) {
+        TaskManager taskManager = new TaskManager();
+        Scanner scanner = new Scanner(System.in);
+        int choice;
+
+        do {
+            taskManager.displayMenu();
+            choice = scanner.nextInt();
+            scanner.nextLine(); // Consume newline
+
+            switch (choice) {
+                case 1:
+                    System.out.print("Enter task name: ");
+                    String taskName = scanner.nextLine();
+                    taskManager.addTask(taskName);
+                    break;
+                case 2:
+                    System.out.print("Enter index of task to delete: ");
+                    int deleteIndex = scanner.nextInt();
+                    taskManager.deleteTask(deleteIndex - 1);
+                    break;
+                case 3:
+                    System.out.print("Enter index of task to mark as completed: ");
+                    int completeIndex = scanner.nextInt();
+                    taskManager.markTaskCompleted(completeIndex - 1);
+                    break;
+                case 4:
+                    taskManager.viewTasks();
+                    break;
+                case 5:
+                    System.out.println("Exiting...");
+                    break;
+                default:
+                    System.out.println("Invalid choice. Please enter a number between 1 and 5.");
+            }
+        } while (choice != 5);
+
+        scanner.close();
+    }
+}

sai chukka/task-1

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+import java.util.Scanner;
+public class SimpleCalculator {
+    public static void main(String[] args) {
+        // Create a Scanner object for user input
+        Scanner scanner = new Scanner(System.in);
+
+        // Prompt the user to enter the first number
+        System.out.print("Enter the first number: ");
+        double firstNumber = scanner.nextDouble();
+
+        // Prompt the user to enter the second number
+        System.out.print("Enter the second number: ");
+        double secondNumber = scanner.nextDouble();
+
+        // Prompt the user to choose an operation
+        System.out.println("Choose an operation:");
+        System.out.println("1. Addition (+)");
+        System.out.println("2. Subtraction (-)");
+        System.out.println("3. Multiplication (*)");
+        System.out.println("4. Division (/)");
+        System.out.print("Enter your choice: ");
+        int choice = scanner.nextInt();
+
+        double result = 0;
+
+        // Perform the selected operation based on user's choice
+        switch (choice) {
+            case 1:
+                result = firstNumber + secondNumber;
+                break;
+            case 2:
+                result = firstNumber - secondNumber;
+                break;
+            case 3:
+                result = firstNumber * secondNumber;
+                break;
+            case 4:
+                if (secondNumber != 0) {
+                    result = firstNumber / secondNumber;
+                } else {
+                    System.out.println("Error: Cannot divide by zero");
+                    return; // Exit the program
+                }
+                break;
+            default:
+                System.out.println("Invalid choice");
+                return; // Exit the program
+        }
+
+        // Display the result
+        System.out.println("Result: " + result);
+
+        // Close the scanner to release resources
+        scanner.close();
+    }
+}

sai chukka/task-3

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+import java.util.*;
+import java.util.Random;
+public class NumberGuessing {
+    public static void main(String[] args) {
+        Scanner scanner = new Scanner(System.in);
+        Random random = new Random();
+        System.out.println("Let's Play Number Guessing Game!");
+        //Enter the number to  Guess
+        System.out.println("I have selected a number between 1 and 100. Try to guess it!");
+        int maxAttempts = 10;
+        int secretNumber = random.nextInt(100) + 1;
+        int attempts = 0;
+        boolean guessedCorrectly = false;
+        while (attempts < maxAttempts) {
+            System.out.print("Enter your guess (between 1 and 100): ");
+            int guess = scanner.nextInt();
+            attempts++;
+            if (guess == secretNumber) {
+                guessedCorrectly = true;
+                break;
+            } else if (guess < secretNumber) {
+                System.out.println("Too low! Try again.");
+            } else {
+                System.out.println("Too high! Try again.");
+            }
+        }
+
+        if (guessedCorrectly) {
+            System.out.println("Congratulations! You've guessed the number " + secretNumber + " correctly in " + attempts + " attempts!");
+        } else {
+            System.out.println("Sorry, you've exceeded the maximum number of attempts. The correct number was: " + secretNumber);
+        }
+
+        scanner.close();
+    }
+}

sai chukka/task-4

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+import java.util.Scanner;
+
+public class Temp {
+    public static void main(String[] args) {
+        Scanner scanner = new Scanner(System.in);
+
+        System.out.println("Welcome to Temperature Converter!");
+        System.out.println("Enter the temperature scale you want to convert from:");
+        System.out.println("1. Celsius");
+        System.out.println("2. Fahrenheit");
+        System.out.println("3. Kelvin");
+
+        System.out.print("Enter your choice (1/2/3): ");
+        int choiceFrom = scanner.nextInt();
+
+        System.out.print("Enter the temperature value: ");
+        double temperature = scanner.nextDouble();
+
+        double convertedTemperature = 0;
+
+        switch (choiceFrom) {
+            case 1:
+                System.out.println("Convert Celsius to:");
+                System.out.println("1. Fahrenheit");
+                System.out.println("2. Kelvin");
+                System.out.print("Enter your choice (1/2): ");
+                int choiceToCelsius = scanner.nextInt();
+                if (choiceToCelsius == 1) {
+                    convertedTemperature = celsiusToFahrenheit(temperature);
+                    System.out.println(temperature + " Celsius = " + convertedTemperature + " Fahrenheit");
+                } else if (choiceToCelsius == 2) {
+                    convertedTemperature = celsiusToKelvin(temperature);
+                    System.out.println(temperature + " Celsius = " + convertedTemperature + " Kelvin");
+                } else {
+                    System.out.println("Invalid choice!");
+                }
+                break;
+            case 2:
+                System.out.println("Convert Fahrenheit to:");
+                System.out.println("1. Celsius");
+                System.out.println("2. Kelvin");
+                System.out.print("Enter your choice (1/2): ");
+                int choiceToFahrenheit = scanner.nextInt();
+                if (choiceToFahrenheit == 1) {
+                    convertedTemperature = fahrenheitToCelsius(temperature);
+                    System.out.println(temperature + " Fahrenheit = " + convertedTemperature + " Celsius");
+                } else if (choiceToFahrenheit == 2) {
+                    convertedTemperature = fahrenheitToKelvin(temperature);
+                    System.out.println(temperature + " Fahrenheit = " + convertedTemperature + " Kelvin");
+                } else {
+                    System.out.println("Invalid choice!");
+                }
+                break;
+            case 3:
+                System.out.println("Convert Kelvin to:");
+                System.out.println("1. Celsius");
+                System.out.println("2. Fahrenheit");
+                System.out.print("Enter your choice (1/2): ");
+                int choiceToKelvin = scanner.nextInt();
+                if (choiceToKelvin == 1) {
+                    convertedTemperature = kelvinToCelsius(temperature);
+                    System.out.println(temperature + " Kelvin = " + convertedTemperature + " Celsius");
+                } else if (choiceToKelvin == 2) {
+                    convertedTemperature = kelvinToFahrenheit(temperature);
+                    System.out.println(temperature + " Kelvin = " + convertedTemperature + " Fahrenheit");
+                } else {
+                    System.out.println("Invalid choice!");
+                }
+                break;
+            default:
+                System.out.println("Invalid choice!");
+        }
+
+        scanner.close();
+    }
+
+    public static double celsiusToFahrenheit(double celsius) {
+        return (celsius * 9 / 5) + 32;
+    }
+
+    public static double celsiusToKelvin(double celsius) {
+        return celsius + 273.15;
+    }
+
+    public static double fahrenheitToCelsius(double fahrenheit) {
+        return (fahrenheit - 32) * 5 / 9;
+    }
+
+    public static double fahrenheitToKelvin(double fahrenheit) {
+        return (fahrenheit + 459.67) * 5 / 9;
+    }
+
+    public static double kelvinToCelsius(double kelvin) {
+        return kelvin - 273.15;
+    }
+
+    public static double kelvinToFahrenheit(double kelvin) {
+        return (kelvin * 9 / 5) - 459.67;
+    }
+}