How to Build a Countdown Timer in C++ | Daily UI Challenge Day 14

#include <iostream> // For input and output operations #include <chrono> // For time-related functions #include <thread> // For adding delay/sleep functionality #include <iomanip> // For formatting output (setfill, setw) #include <string> // For using the string data type using namespace std; // CountdownTimer class class CountdownTimer { private: int hours; // Stores hours for the timer int minutes; // Stores minutes for the timer int seconds; // Stores seconds for the timer bool is_running; // Flag to track if the timer is running bool is_paused; // Flag to track if the timer is paused // Helper function to format time as HH:MM:SS string formatTime() const { // setw(2) ensures two-digit formatting (e.g., 01 instead of 1) cout << setfill('0') << setw(2) << hours << ":"; cout << setfill('0') << setw(2) << minutes << ":"; cout << setfill('0') << setw(2) << seconds; // Function signature requires returning a string, but it's missing return ""; // Returning an empty string (fix needed) } // Update timer values (decreases time by one second) void updateTimer() { if (seconds > 0) { seconds--; // Decrease seconds } else if (minutes > 0) { minutes--; // Borrow from minutes seconds = 59; } else if (hours > 0) { hours--; // Borrow from hours minutes = 59; seconds = 59; } } public: // Constructor to initialize timer with given hours, minutes, and seconds CountdownTimer(int h = 0, int m = 0, int s = 0) : hours(h), minutes(m), seconds(s), is_running(false), is_paused(false) { // Normalize time values to ensure valid input minutes += seconds / 60; // Convert excess seconds into minutes seconds %= 60; // Keep seconds within 0-59 range hours += minutes / 60; // Convert excess minutes into hours minutes %= 60; // Keep minutes within 0-59 range } // Function to start the countdown void start() { is_running = true; is_paused = false; // Continue looping until the timer reaches zero while (is_running && (hours > 0 || minutes > 0 || seconds > 0)) { if (!is_paused) { // \r moves the cursor to the beginning of the line (overwrites text) cout << "\r" << formatTime() << flush; this_thread::sleep_for(chrono::seconds(1)); // Wait for 1 second updateTimer(); // Decrease time } } // When time is up, display final message if (hours == 0 && minutes == 0 && seconds == 0) { cout << "\r" << formatTime() << " - Time's up!" << endl; } } // Function to pause the timer void pause() { is_paused = true; } // Function to resume the timer void resume() { is_paused = false; } // Function to stop the timer completely void stop() { is_running = false; } // Function to check if the timer is running bool isRunning() const { return is_running; } // Function to check if the timer is paused bool isPaused() const { return is_paused; } }; // Main function: Entry point of the program int main() { cout << "Countdown Timer Demo\n"; cout << "Setting timer for 1 minute and 30 seconds...\n"; // Creating an object of CountdownTimer with 1 minute 30 seconds CountdownTimer timer(0, 1, 30); timer.start(); // Start the countdown return 0; // Return 0 to indicate successful execution } 

// Create a timer for 2 hours, 30 minutes, and 15 seconds CountdownTimer timer(2, 30, 15); // Start the countdown timer.start(); // You can pause/resume as needed timer.pause(); timer.resume(); // Stop the timer early if needed timer.stop();