Xây dựng một lớp Time mô tả thông tin về giờ, phút giây

/**************************************************************/
#include <iostream>
#include <iomanip>
using namespace std;

class CTime
{
private:
int hour;
int minute;
int second;
public:
// Ham tao
CTime(int h = 0, int m = 0, int s = 0): hour(h), minute(m), second(s)
{
}
void set(int h, int m, int s)
{
hour = h;
minute = m;
second = s;
}
void setHour(int h) {hour = h;}
void setMinute(int m) {minute = m;}
void setSencond(int s) {second = s;}
int getHour() {return hour;}
int getMinute() {return minute;}
int getSecond() {return second;}
bool checkValidTime();
void display24();
void display12();
};

void CTime::display24()
{
if (checkValidTime())
{
cout << setfill('0') << setw(2) << hour << " : "
<< setfill('0') << setw(2) << minute << " : "
<< setfill('0') << setw(2) << second << endl;
}
else
{
cout << setfill('0') << setw(2) << hour << " : "
<< setfill('0') << setw(2) << minute << " : "
<< setfill('0') << setw(2) << second << " is invalid" << endl; } } void CTime::display12() { if (checkValidTime()) { if (hour >= 12)
{
cout << setfill('0') << setw(2) << hour-12 << " : "
<< setfill('0') << setw(2) << minute << " : "
<< setfill('0') << setw(2) << second << " (PM) " << endl;
}
else
{
cout << setfill('0') << setw(2) << hour << " : "
<< setfill('0') << setw(2) << minute << " : "
<< setfill('0') << setw(2) << second << " (AM)" << endl;
}
}
else
{
cout << setfill('0') << setw(2) << hour << " : "
<< setfill('0') << setw(2) << minute << " : "
<< setfill('0') << setw(2) << second << " is invalid" << endl;
}
}

bool CTime::checkValidTime()
{
int h, m, s;
h = getHour();
m = getMinute();
s = getSecond();
if (h < 0 || h > 23 ||
m < 0 || m > 59 ||
s < 0 || s > 59)
{
return false;
}
return true;
}

void main()
{
CTime time(30, 45, 0);
time.display12();
time.setSencond(30);
time.display24();
time.set(13, 59, 0);
time.display24();
system("pause");
}