#include <iostream>
#include <cstdlib>
#include <ctime>    //for the functions time and localtime
using namespace std;

int main()
{
        //Get the current hour of the day (0 to 23 inclusive).
        time_t t {time(nullptr)};
        tm *p {localtime(&t)};
        int hour {p->tm_hour};

	cout << "On a 24-hour clock, the current hour is " << hour << ".\n";
	cout << "On a 12-hour clock, the current hour is ";

	if (hour == 0) {
		cout << 12;          //midnight
	} else if (hour <= 12) {
		cout << hour;        //morning and noon
	} else {
		cout << hour - 12;   //the rest of the day
	}

	cout << " ";                 //space between the number and the suffix

	if (hour < 12) {
		cout << "a.m.";      //ante meridiem
	} else {
		cout << "p.m.";      //post meridiem
	}

	cout << "\n";
        return EXIT_SUCCESS;
}