the time24 class to include a constructor to initialize a time24 object with a time in the 12-hour

time24 t( 1, 0, 0, "pm" ) ;

is equivalent to:

time24 t( 13, 0, 0 ) ;

The prototype of the new constructor is:

time24( int h, int m, int s, const string& am_pm ) ; 

(Note, the time24 class please see the book of “learn C++ through English and Chinese, you may have it from me)

#include<iostream>
#include<string>
using namespace std;
class time24
{
public:
	time24(int h, int m, int s, const std::string& am_pm);
	void display();
private:
	int hours;
	int minutes;
	int seconds;
};
time24::time24(int h, int m, int s, const std::string& am_pm)
{
	if (am_pm == "am")
	{
		hours = h;
		minutes = m;
		seconds = s;
	}
	else if (am_pm == "pm")
	{
		hours = h + 12;
		minutes = m;
		seconds = s;
	}
}
void time24::display()
{
	cout << "the time is" << hours << "." << minutes << "." << seconds << endl;
}
int main()

{
	time24 t1(1, 0, 0, "pm");
	t1.display();
}