Example: Time Format Converter in C++

// Time Format Converter
#include <iostream>
#include <iomanip> // Required for std::setw and std::setfill
using namespace std;

int main() {
    int hours, minutes, seconds;

    // Step 1: Prompt user for input and read hours, minutes, seconds
    cout << "Enter hours (0-23): ";
    cin >> hours;
    cout << "Enter minutes (0-59): ";
    cin >> minutes;
    cout << "Enter seconds (0-59): ";
    cin >> seconds;

    // Basic input validation (optional but recommended)
    if (hours < 0 || hours > 23 || minutes < 0 || minutes > 59 || seconds < 0 || seconds > 59) {
        cout << "Invalid time input. Please enter valid hours (0-23), minutes (0-59), and seconds (0-59)." << endl;
        return 1; // Indicate an error
    }

    // Step 2: Print in 24-hour format
    cout << "\nTime in 24-hour format: ";
    cout << setfill('0') << setw(2) << hours << ":"
         << setfill('0') << setw(2) << minutes << ":"
         << setfill('0') << setw(2) << seconds << endl;

    // Step 3: Convert and print in Standard (AM/PM) format
    string period = "AM";
    int displayHours = hours;

    if (hours >= 12) {
        period = "PM";
        if (hours > 12) {
            displayHours = hours - 12;
        }
    }
    if (hours == 0) {
        displayHours = 12; // 00:XX AM is 12:XX AM
    }

    cout << "Time in Standard (AM/PM) format: ";
    cout << setfill('0') << setw(2) << displayHours << ":"
         << setfill('0') << setw(2) << minutes << ":"
         << setfill('0') << setw(2) << seconds << " " << period << endl;

    return 0;
}