Tech | phoenixstudio™

You can draw FA, without hassle by using free, open source software named Graphviz.
Since it is open source, it is free to be downloaded and modified. That’s good about open source.

You can download it here.
http://www.graphviz.org/Download.php

You can draw FA like this:

With instruction like this and saved *.gv:

digraph finite_state_machine {
    rankdir=LR;
    size="8,8"

    node [shape = doublecircle]; q6;
    node [shape = point ]; qi

    node [shape = circle];
    qi -> q0;

	q0 -> q1 [ label = "a" ];
	q1 -> q0 [ label = "b" ];
	q0 -> q2 [ label = "b" ];
	q2 -> q3 [ label = "a" ];
	q3 -> q3 [ label = "a" ];
	q3 -> q2 [ label = "b" ];
	q2 -> q4 [ label = "b" ];
	q4 -> q2 [ label = "a" ];
	q2 -> q5 [ label = "d" ];
	q5 -> q2 [ label = "a" ];
	q2 -> q6 [ label = "c" ];
	q5 -> q6 [ label = "b" ];

}

digraph finite_state_machine {

rankdir=LR;

size="8,8"

node [shape = doublecircle]; q6;

node [shape = point ]; qi

node [shape = circle];

qi -> q0;

q0 -> q1 [ label = "a" ];

q1 -> q0 [ label = "b" ];

q0 -> q2 [ label = "b" ];

q2 -> q3 [ label = "a" ];

q3 -> q3 [ label = "a" ];

q3 -> q2 [ label = "b" ];

q2 -> q4 [ label = "b" ];

q4 -> q2 [ label = "a" ];

q2 -> q5 [ label = "d" ];

q5 -> q2 [ label = "a" ];

q2 -> q6 [ label = "c" ];

q5 -> q6 [ label = "b" ];

}

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