Download Algebraic theory of automata and languages by Masami Ito PDF

By Masami Ito

ISBN-10: 9810247273

ISBN-13: 9789810247270

The speculation of formal languages and the idea of automata have been either initiated within the overdue Fifties, explains Ito (Kyoto Sangyo U., Japan), and the 2 fields have seeing that built into very important theoretical foundations of desktop technological know-how. He seems to be on the from the algebraic viewpoint, starting with the algebraic constitution of automata, and in part ordered units of automata as one of those worldwide conception. Then he delves into grammars, languages, and operations on languages. To finish, he introduces directable automata as a unique case.

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3 AN EXAMPLE Let us now apply this mechanism to our division example. Since, the division operation may throw an exception, we guard it using a try block as follows: try { result = 100/d; } If the value of d is zero, an exception occurs during the division operation. The JVM creates an object representing the exception and throws the object which essentially disrupts the normal control of execution and places it just after the try block. The JVM then looks for an appropriate catch block that can hold the object thrown.

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The following example uses a try-catch block: void g() { try { f(); } catch(Exception e) { //... } } It is useful if g() knows what exactly it should do if f() throws an exception. Otherwise, g() may re-specify it using a separate throws clause as follows: void g() throws Exception { f(); } It is also possible to handle the Exception using a try-catch block and still declare it to be thrown as follows: void g() throws Exception { try { f(); } catch(Exception e) { //take actions... throw e; } } In this case, g() takes necessary steps in the catch block as far as it can and re-throws the caught exception expecting that some code else will handle it completely.

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