Answer to Question #184114 in C++ for Uzair Ali

Question

Constructor 

Objective: Design and implement a class Time which has constructor and destructor 

member function. You class should use multiple constructors and a destructor.

Define class for Time considering the followings:

a. Enlist data members and methods with access specifies.

b. At least one member function and data members should be constant

Answer 1

#include <iostream>
 
using namespace std;
 
class Time
{
public:
	Time();
	Time(int s, int m, int h);
	~Time();
	void Display() const;
	void AddHour();
	int GetSec() const { return sec; }
	int GetMins() const { return mins; }
	int GetHours() const { return hours; }
 
private:
	int sec;
	int hours;
	int mins;
	const int INIT = 0;
};
 
Time::Time()
{
	sec = INIT;
	mins = INIT;
	hours = INIT;
}
 
Time::Time(int s, int m, int h)
{
	if (s < 0) sec = 0;
	else sec = s % 60;
	if (m < 0) m = 0;
	else mins = m % 60;
	if (h < 0) h = 0;
	else hours = h % 24;
}
 
void Time::Display() const
{
	cout << hours / 10 << hours % 10 << ":" << mins / 10 << mins % 10 << ":" << sec / 10 << sec % 10 << endl;
}
 
void Time::AddHour()
{
	hours = (hours + 1) % 24;
}
 
Time::~Time()
{
	cout << "Time destructor" << endl;
}
 
int main()
{
	Time t1;
	Time t2(225, 125, 100);
	t1.Display();
	t2.Display();
	t1.AddHour();
	t2.AddHour();
	t1.Display();
	t2.Display();
	system("pause");
	return 0;
}