todo.cpp

#include <iostream>
#include <string>
#include <vector>

struct Task {
  std::string description;
  bool completed;

  Task(const std::string& desc) : description(desc), completed(false) {}
};

void displayTasks(const std::vector<Task>& tasks) {
    if (tasks.empty()) {
        std::cout << "No tasks yet!" << std::endl;
        return;
    }
    
    std::cout << "\n=== My Tasks ===" << std::endl;
    for (size_t i = 0; i < tasks.size(); ++i) {
        std::cout << i + 1 << ". ";
        if (tasks[i].completed) {
            std::cout << "[X] ";
        } else {
            std::cout << "[ ] ";
        }
        std::cout << tasks[i].description << std::endl;
    }
    std::cout << std::endl;
}

int main() {
  std::vector<Task> tasks;
  std::string input;

  std::cout << "Welcome to TODO List!" << std::endl;
    std::cout << "Commands: add, list, complete, quit" << std::endl;
    
    // Main loop
    while (true) {
        std::cout << "> ";
        std::cin >> input;  // Read one word
        
        if (input == "quit") {
            std::cout << "Goodbye!" << std::endl;
            break;  // Exit the loop
        }
        else if (input == "list") {
            displayTasks(tasks);
        }
        else if (input == "add") {
            // Read the rest of the line as the task description
            std::string description;
            std::getline(std::cin, description);  // Get the rest of the line
            
            // Remove leading space
            if (!description.empty() && description[0] == ' ') {
                description = description.substr(1);
            }
            
            if (!description.empty()) {
                tasks.push_back(Task(description));
                std::cout << "Added: " << description << std::endl;
            } else {
                std::cout << "Please provide a task description" << std::endl;
            }
        }
        else if (input == "complete") {
            int taskNum;
            std::cin >> taskNum;  // Read the task number
            
            if (taskNum >= 1 && taskNum <= static_cast<int>(tasks.size())) {
                tasks[taskNum - 1].completed = true;
                std::cout << "Completed: " << tasks[taskNum - 1].description << std::endl;
            } else {
                std::cout << "Invalid task number!" << std::endl;
            }
        }
        else {
            std::cout << "Unknown command. Try: add, list, complete, quit" << std::endl;
        }
    }
    
    return 0; 
}