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It is permissible for the program to [[Run as a daemon or service|daemonize]], or to slave off a scheduler, and it is permissible to use alternative notification methods (such as producing a written notice "Two Bells Gone"), if these are more usual for the system type.
=={{header|C++}}==
This version uses local time.
<lang cpp>
#include <iostream>
#include <iomanip>
#include <string>
#include <windows.h>
//--------------------------------------------------------------------------------------------------
using namespace std;
//--------------------------------------------------------------------------------------------------
class bells
{
public:
void start()
{
_inst = this; _w = 5;
watch[0] = "Middle"; watch[1] = "Morning"; watch[2] = "Forenoon"; watch[3] = "Afternoon"; watch[4] = "Dog"; watch[5] = "First";
count[0] = "One"; count[1] = "Two"; count[2] = "Three"; count[3] = "Four"; count[4] = "Five"; count[5] = "Six"; count[6] = "Seven"; count[7] = "Eight";
CreateThread( NULL, 0, bell, NULL, 0, NULL );
}
private:
static DWORD WINAPI bell( LPVOID p )
{
DWORD wait = _inst->whatTime();
while( true )
{
Sleep( wait );
_inst->playBell();
wait = _inst->whatTime();
}
return 0;
}
DWORD whatTime()
{
SYSTEMTIME ts; GetLocalTime( &ts );
int m = ts.wMinute >= 30 ? ts.wMinute - 30 : ts.wMinute;
return( 1800000 - ( ( m * 60 + ts.wSecond ) * 1000 + ts.wMilliseconds ) );
}
void playBell()
{
SYSTEMTIME st; GetLocalTime( &st );
int b = ( 2 * st.wHour + st.wMinute / 30 ) % 8; b = b == 0 ? 8 : b;
char hr[32]; wsprintf( hr, "%.2d:%.2d", st.wHour, st.wMinute );
cout << left << hr << " - " << setw( 9 ) << watch[w] << " watch - " << setw( 5 ) << count[b - 1] << " Bell";
if( b > 1 ) cout << "s"; else cout << " "; cout << " Gone." << endl;
if( b == 8 ) if( ++_w > 5 ) _w = 0;
for( int x = 0, c = 0; x < b; x++, c++ )
{
cout << "\7";
Sleep( 500 );
if( !( c % 2 ) ) Sleep( 300 );
}
}
int _w;
string watch[7], count[8];
static bells* _inst;
};
//--------------------------------------------------------------------------------------------------
bells* bells::_inst = 0;
//--------------------------------------------------------------------------------------------------
int main( int argc, char* argv[] )
{
bells b;
b.start();
while( 1 );
return 0;
}
//--------------------------------------------------------------------------------------------------
</lang>
Output:
<pre>
00:00 - First watch - Eight Bells Gone.
00:30 - Middle watch - One Bell Gone.
01:00 - Middle watch - Two Bells Gone.
01:30 - Middle watch - Three Bells Gone.
02:00 - Middle watch - Four Bells Gone.
02:30 - Middle watch - Five Bells Gone.
03:00 - Middle watch - Six Bells Gone.
03:30 - Middle watch - Seven Bells Gone.
04:00 - Middle watch - Eight Bells Gone.
04:30 - Morning watch - One Bell Gone.
05:00 - Morning watch - Two Bells Gone.
05:30 - Morning watch - Three Bells Gone.
06:00 - Morning watch - Four Bells Gone.
06:30 - Morning watch - Five Bells Gone.
07:00 - Morning watch - Six Bells Gone.
07:30 - Morning watch - Seven Bells Gone.
08:00 - Morning watch - Eight Bells Gone.
08:30 - Forenoon watch - One Bell Gone.
09:00 - Forenoon watch - Two Bells Gone.
09:30 - Forenoon watch - Three Bells Gone.
10:00 - Forenoon watch - Four Bells Gone.
10:30 - Forenoon watch - Five Bells Gone.
11:00 - Forenoon watch - Six Bells Gone.
11:30 - Forenoon watch - Seven Bells Gone.
12:00 - Forenoon watch - Eight Bells Gone.
12:30 - Afternoon watch - One Bell Gone.
13:00 - Afternoon watch - Two Bells Gone.
13:30 - Afternoon watch - Three Bells Gone.
14:00 - Afternoon watch - Four Bells Gone.
14:30 - Afternoon watch - Five Bells Gone.
15:00 - Afternoon watch - Six Bells Gone.
15:30 - Afternoon watch - Seven Bells Gone.
16:00 - Afternoon watch - Eight Bells Gone.
16:30 - Dog watch - One Bell Gone.
17:00 - Dog watch - Two Bells Gone.
17:30 - Dog watch - Three Bells Gone.
18:00 - Dog watch - Four Bells Gone.
18:30 - Dog watch - Five Bells Gone.
19:00 - Dog watch - Six Bells Gone.
19:30 - Dog watch - Seven Bells Gone.
20:00 - Dog watch - Eight Bells Gone.
20:30 - First watch - One Bell Gone.
21:00 - First watch - Two Bells Gone.
21:30 - First watch - Three Bells Gone.
22:00 - First watch - Four Bells Gone.
22:30 - First watch - Five Bells Gone.
23:00 - First watch - Six Bells Gone.
23:30 - First watch - Seven Bells Gone.
</pre>
=={{header|D}}==
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