a simple traffic light

Dear all. This is simple, but I seem to be stuck. Imagin the following as "idealized language syntax" TYPE State { VARIANT Prepare_to_go, VARIANT go, VARIANT Prepare_to_stop, VARIANT stop } The above is (as you will have guessed) different states of a traffic light. My problem > How do you realize variants in c#? Ie Prepare_to_go is a State, so is "go", and so is "stop".. etc. they are all different states. When the above is coded in C#, and an object is created: for example State s = new State() Console.Write(s.state); // should print default "Stop", ie the object is initialized in "STOP" state when s.state = Prepare_to_go; Console.WriteLine(s.state); // should print the new state of the object. _________________________________________________________________________ My problem is about changing object states. Please give me guiudlines how to do this in c#. I have the following code: Class State { string state; public void setState(string _state) { state = _state; } ..... } etc.. BUT AS YOU CAN GUESS this is based on strings. The questions is about accomplishing variant states. Not using strings. I hope someone can guide me.

enum State { PrepareToGo, Go, PrepareToStop, Stop, } class myClass { private State _state; public myClass() { _state = State.PrepareToGo; Console.WriteLine( _state ); // prints "PrepareToGo" _state = State.Go; Console.WriteLine( _state ); // prints "Go" } } One must note, that the datatypes of the enum entries are by default of type System.Int. Meaning that State.PrepareToGo will have value 0, Go will have 1 etc. you can change the starting value or any other value there by assigning it withiin the enum. enum State { PrepareToGo = 22, Go = 45, PrepareToStop = 431, Stop = 2345, } Note that all values must be of type System.Int You can assign other values to them like this enum State : uint { PrepareToGo = 0x01, Go 0x02, PrepareToStop = 0x04, Stop 0x08, } This example shows how you can use an Enum as a bitflag. Youa ccomplish this by giving it the System.Flags() attribute [Flags] enum State { PrepareToGo = 1, Go = 2, PrepareToStop = 4, Stop = 8, } This last example allows you to use an Enum as a bitflag, like this int _myflag = State.PrepareToGo | State.Go; // will contain 1 | 2 ... if( _state & State.Go == State.Go ) {} // State.Go has been set if( _state & State.Stop == State.Stop ) {} // State.Stop has been set

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jimteeuwen22y ago
enum State { PrepareToGo, Go, PrepareToStop, Stop, } class myClass { private State _state; public myClass() { _state = State.PrepareToGo; Console.WriteLine( _state ); // prints "PrepareToGo" _state = State.Go; Console.WriteLine( _state ); // prints "Go" } } One must note, that the datatypes of the enum entries are by default of type System.Int. Meaning that State.PrepareToGo will have value 0, Go will have 1 etc. you can change the starting value or any other value there by assigning it withiin the enum. enum State { PrepareToGo = 22, Go = 45, PrepareToStop = 431, Stop = 2345, } Note that all values must be of type System.Int You can assign other values to them like this enum State : uint { PrepareToGo = 0x01, Go 0x02, PrepareToStop = 0x04, Stop 0x08, } This example shows how you can use an Enum as a bitflag. Youa ccomplish this by giving it the System.Flags() attribute [Flags] enum State { PrepareToGo = 1, Go = 2, PrepareToStop = 4, Stop = 8, } This last example allows you to use an Enum as a bitflag, like this int _myflag = State.PrepareToGo | State.Go; // will contain 1 | 2 ... if( _state & State.Go == State.Go ) {} // State.Go has been set if( _state & State.Stop == State.Stop ) {} // State.Stop has been set