Question

3.

write a c++ program:

Design and implement a class called Clock that describes the time of a clock:

a) Include in the class 3 constructors with one, two, and three parameters to set the hours, the minutes, and the seconds, respectively.

b) Include also a default constructor that sets the member variables of the class to 00:00:00.

c) Write a member function to increment the time by a given amount, and second member

function to reset the clock. The reset function set the time back to 00:00:00.

d) Include a friend function to display the time in both in AM/PM format as well as in military

format (i.e. in military format, 4:00pm is written as 16:00).

e) Write a driver (i.e. a main) that tests your class and uses all the functions you have created.

f) Separate the ADT from its implementation and write them in 2 separate files. The main

must be in a third file. Be sure all the methods of the ADT are documented (i.e. they have the comments and Precondition and Postcondition as shown in all the examples of your book). If you don’t remember how to separate your program in multiple files, watch again the video of Chapter 10 “Separate Interface and Implementation – Part one and Part Two”.

Call your main program ex13_3.cpp.

Cong

Answer 1

// clock.h

#ifndef CLOCK_H_
#define CLOCK_H_

#include <iostream>
using namespace std;

class Clock
{
private: // private data members
   int hours;
   int minutes;
   int seconds;
public:
   // constructors
   Clock(int seconds);
   Clock(int minutes, int seconds);
   Clock(int hours, int minutes, int seconds);
   Clock(); //default constructor
   void incrementTime(int secondsAmount); // increment the time by given number of seconds
   void reset(); // reset the time back to 00:00:00
   friend ostream& operator<<(ostream &out, const Clock &clock); // output the time in AM/PM and military format
};

#endif

//end of clock.h

// clock.cpp

#include "clock.h"
#include <iomanip>

Clock ::Clock()
{
   hours=0;
   minutes=0;
   seconds=0;
}

Clock ::Clock(int seconds)
{
   this->seconds = seconds;
   minutes=0;
   hours=0;
   if(this->seconds > 59)
   {
       minutes = this->seconds/60;
       this->seconds = this->seconds%60;
   }

   if(minutes > 59)
   {
       hours = minutes/60;
       minutes = minutes%60;
   }

   if(hours > 23)
   {
       hours = hours%24;
   }
}

Clock ::Clock(int minutes, int seconds)
{
   this->seconds = seconds;
   this->minutes=minutes;
   hours=0;
   if(this->seconds > 59)
   {
       this->minutes += this->seconds/60;
       this->seconds = this->seconds%60;
   }

   if(this->minutes > 59)
   {
       hours = this->minutes/60;
       this->minutes = this->minutes%60;
   }

   if(hours > 23)
   {
       hours = hours%24;
   }
}

Clock::Clock(int hours, int minutes, int seconds)
{
   this->seconds = seconds;
   this->minutes = minutes;
   this->hours = hours;

   if(this->seconds > 59)
   {
       this->minutes += this->seconds/60;
       this->seconds = this->seconds%60;
   }

   if(this->minutes > 59)
   {
       this->hours += this->minutes/60;
       this->minutes = this->minutes%60;
   }

   if(this->hours > 23)
   {
       this->hours = this->hours%24;
   }
}

void Clock::incrementTime(int secondsAmount)
{
   this->seconds += secondsAmount;
   if(this->seconds > 59)
   {
       this->minutes += this->seconds/60;
       this->seconds = this->seconds%60;
   }

   if(this->minutes > 59)
   {
       this->hours += this->minutes/60;
       this->minutes = this->minutes%60;
   }

   if(this->hours > 23)
   {
       this->hours = this->hours%24;
   }
}

void Clock::reset()
{
   hours=0;
   minutes=0;
   seconds =0;
}

ostream& operator<<(ostream &out, const Clock &clock)
{
   out<<" Time in AM/PM format : ";
   if(clock.hours >=0 && clock.hours <=11)
   {
       out<<setfill('0') << setw(2)<<clock.hours<<":"<<setfill('0') << setw(2)<<clock.minutes<<":"<<setfill('0') << setw(2)<<clock.seconds<<" AM"<<endl;
   }else if(clock.hours == 12)
   {
       out<<setfill('0') << setw(2)<<clock.hours<<":"<<setfill('0') << setw(2)<<clock.minutes<<":"<<setfill('0') << setw(2)<<clock.seconds<<" PM"<<endl;
   }
   else
   {
       int hour = clock.hours-12;
       out<<setfill('0') << setw(2)<<hour<<":"<<setfill('0') << setw(2)<<clock.minutes<<":"<<setfill('0') << setw(2)<<clock.seconds<<" PM"<<endl;
   }

   out<<" Time in military format : "<<setfill('0') << setw(2)<<clock.hours<<":"<<setfill('0') << setw(2)<<clock.minutes<<":"<<setfill('0') << setw(2)<<clock.seconds<<endl;

   return out;
}

//end of clock.cpp

// main.cpp : C++ program to create and test class ClockWork

#include <iostream>
#include "clock.h"
using namespace std;

int main() {

   Clock clock(17,35,59);
   cout<<clock<<endl;
   clock.incrementTime(121);
   cout<<clock<<endl;
   clock.reset();
   cout<<clock<<endl;
   return 0;
}

//end of main.cpp

Output: