static void Main(string[] args)
{
var stopWatch = new StopWatch();
string command;
Console.WriteLine("type 'start', 'stop', 'pause', 'resume' or 'quit'");
command = Console.ReadLine().ToLower();
while (command != "quit")
{
command = command.ToLower();
if (command == "start")
{
stopWatch.Start();
command = Console.ReadLine().ToLower();
}
else if (command == "stop")
{
stopWatch.Stop();
command = Console.ReadLine().ToLower();
}
else if (command == "pause")
{
stopWatch.Pause();
command = Console.ReadLine().ToLower();
}
else if (command == "resume")
{
stopWatch.Resume();
command = Console.ReadLine().ToLower();
}
else
{
Console.WriteLine("invalid command. Please type 'start', 'stop' or 'quit'");
command = Console.ReadLine().ToLower();
}
}
}
static void Main(string[] args)
{
/***************************************
* /* Exercise 1: Design a Stopwatch *
* /***************************************
* Design a class called Stopwatch.
* The job of this class is to simulate a stopwatch.
* It should provide two methods: Start and Stop. We call the start method first, and the stop method next.
* Then we ask the stopwatch about the duration between start and stop.
* Duration should be a value in TimeSpan. Display the duration on the console.
* We should also be able to use a stopwatch multiple times.
* So we may start and stop it and then start and stop it again.
* Make sure the duration value each time is calculated properly.
* We should not be able to start a stopwatch twice in a row (because that may overwrite the initial start time).
* So the class should throw an InvalidOperationException if its started twice.
*
* Educational tip:
* The aim of this exercise is to make you understand that a class should be always in a valid state.
* We use encapsulation and information hiding to achieve that.
* The class should not reveal its implementation detail.
* It only reveals a little bit, like a blackbox.
* From the outside, you should not be able to misuse a class because you shouldn’t be able to see the implementation detail.
*/
const string exit = "EXIT";
const string invalid = "INVALID";
int input;
TimeSpan result;
// Start program
do
{
do
{
UserInterface.WelcomeScreen();
input = int.Parse(Console.ReadLine());
// EXIT
if (input == 9)
{
UserInterface.WelcomeScreen(exit);
}
// INVALID OPTION
else if (input != 1 && input != 9)
{
UserInterface.WelcomeScreen(invalid);
}
} while (input != 9 && input != 1);
// STOPPER STARTED
if (input == 1)
{
StopWatch.Start();
UserInterface.Started();
input = int.Parse(Console.ReadLine());
switch (input)
{
case 1:
StopWatch.Start();
break;
case 2:
result = StopWatch.Stop();
UserInterface.Result(result);
break;
}
Console.ReadLine();
}
} while (input != 9);
}
