JFLAP both DFA and NFA are created using Finite Automata. . JFLAP’s home page also contains a very thorough tutorial of everything the program can do. JFLAP is written in Java to allow it to run on a range of platforms. JFLAP are going to open a JFLAP saved file of an existing finite automaton (FA). From the. Fill out the form. – 3. Download page. – 4. Get

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To see all the nondeterministic states in the NFA, select Test: To change the text simply click in the note, select where you want to start typing, and type your note. When a tool is selected, it tutkrial shaded, as the Attribute Editor tool is above. The simulator will no longer step these configurations.

To select more than one state tutorjal block at once, choose the tutorail editor, click on empty space, and drag the mouse. Your simulator will now look like this:.

To delete q 3first select the Deletor tool on the toolbar. When you are done, click Run Inputs to test your FA on all the input strings. You might notice that the q 3 is not used and can be deleted. These modes will be described in more detail shortly.

Thus, we know that q 1 has an outgoing transition on bthat it cannot loop back to q 1. We can double-check by resetting the simulator. We are not very sure how many states we will need, so we created four states. A new tab will appear displaying the automaton at the top of the window, and configurations at the bottom.

To select a tool, click on the corresponding icon with your mouse.

Enter “b” in the textbox the same way you entered “a” for the previous transition. To define it as the final state, right-click on the state and click the checkbox Final.


A dialog box prompting you for input will appear.

Click Step again to process the next a. A bounding box appears and all states turorial blocks within the box are selected, their color now blue. Preferences in the main menu to change the symbol representing the empty string.

JFLAP: Building a Finite Automaton

A text box should appear over the state:. When you are done, it should look like this:. The different modes dictate the way mouse clicks affect the machine. JFLAP will now let you apply predefined graph layout commands to your graph, which can help with a more aesthetically pleasing graph.

JFLAP Tutorial

Click Step another tugorial times to find an accepting configuration. This should bring up a new window that allows you to create and edit an FA. There are two options for the transtion: It will have a double outline, indicating that it is the final state.

From the traceback, we can tell that jlap configuration started at q 0 and took the transition to q 1 after processing the first a. To enter the input strings, click on the first row in the Input column and type in the string.

Notice that two of the configurations are highlighted red, indicating they were rejected.

To proceed with the frozen configuration, select it and click Thaw. First, let’s create several states. To deselect them, click anywhere else. Type “a” in the text box and press Enter.

Clicking Clear deletes all the input strings, while Enter Lambda enters the empty string at the cursor. To move the selected states as a group, click and drag any of them. If we click Step again, we will see that the last configuration is rejected. A new widow will appear showing the traceback of that configuration:. To step through input on an NFA, select Input: Next, we know that strings in our language must end with a odd number of b ‘s.


A white arrowhead appreas to the left of q 0 to indicate that it is the inital state. With that configuration frozen, as you click Step to step through the configuration on q 3the frozen configuration remains the same. Thus, the transition cannot be to q 0and it must be to q 2.

View Trace brings up a separate window that shows the trace of the slected input. This concludes the walkthrough, although there is an appendix noting a few more features that JFLAP supports. We know strings in our language can start with a ‘s, so, the initial state must have an outgoing transition on a. To define it to be our initial state, first select the Attribute Editor tool on the toolbar.

Now that you’ve completed your FA, you might want to test it to see if it really accepts strings from the language. To do so we need to activate that State Creator tool by clicking the button on the toolbar.

Building Your First Finite Automaton

If the transition on b was to the initial state q 0strings would not have to be of the form a m b n ; strings such as ababab would also be accepted.

The configuration icon shows the current state of the configuration in the top left hand corner, and input on the white tape below. JFLAP can help with that. Your editor window should look jfpap like this:.

The current state is shaded. Lastly, we know that only strings that end with an odd number of b ‘s should be accepted.