digitalclock.cpp

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// Exercise 15.12: DigitalClock.cpp
// Simulates the operation of a digital clock.
// NOTE: This file must be compiled with Time.cpp.
#include <iostream> // required to perform C++ stream I/O
#include <ctime> // contains prototype for function time

// include definition of class Time from Time.h
#include "Time.h"

using namespace std; // for accessing C++ Standard Library members

int main()
{
   // define variables
   int hour;   // store the current hour
   int minute; // store the current minute
   int second; // store the current second
   time_t currentTime; // store time program has been running

   // prompt the user for localTime's initial values
   cout << "\nEnter current hour: ";
   cin >> hour;

   cout << "Enter current minute: ";
   cin >> minute; // set current minute

   cout << "Enter current second: ";
   cin >> second; // set current second

   // instantiate object localTime of class Time
   Time localTime( hour, minute, second );  

   cout << endl;

   localTime.displayTime();

   while ( true )
   {
      currentTime = time( 0 ); // store the current time
     
      // busy wait until one second has passed  
      while ( time( 0 ) < ( currentTime + 1 ) );

      localTime.tick(); // advance the time in localTime  
      cout << "\r";                                       
      localTime.displayTime(); // display the updated time
   } // end while

   return 0; // indicate that program ended successfully

} // end function main


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