Log Message Timestamp

#include <iostream>
#include <string>
using namespace std;

void logMessage(string message, bool flag = false) 
{
    if (!flag)
    {
        std::cout << message;
    }
    else
    {
        std::cout << "[123456] " << message;  
    }

}

int main() {
    int mode;
    string msg;
    cin >> mode >> msg;

    if (mode == 0) {
        logMessage(msg);            // use default argument
    } else {
        logMessage(msg, true);      // enable timestamp
    }

    return 0;
}