Algorithms and data structures, Oberon version by Wirth N. PDF

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Given a text T in the form of a sequence and lists of a small number of words in the form of two arrays A and B. Assume that words are short arrays of characters of a small and fixed maximum length. Write a program that transforms the text T into a text S by replacing each occurrence of a word Ai by its corresponding word Bi. 6. Compare the following three versions of the binary search with the one presented in the text. Which of the three programs are correct? Determine the relevant invariants.

This leads us to the concept of a scanner which, after each scan allows to inspect type and value of the item read. A scanner acts like a rider in the case of files. However, it imposes a certain syntax on the text to be read. Wirth. Algorithms and Data Structures. Oberon version 34 item = integer | RealNumber | identifier | string | SpecialChar. integer = [“-”] digit {digit}. ” digit {digit} [(“E” | “D”)[“+” | “-” digit {digit}]. identifier = letter {letter | digit}. string = ‘”’ {any character except quote} ‘”’.

12. Partial pattern matches and computation of D. If there is no solution for D, then there is no match in positions below i+1. Then we set D := -1. Such a situation is shown in the upper part in Fig. 13. The last example in Fig. 12 suggests that we can do even slightly better; had the character pj been an A instead of an F, we would know that the corresponding string character could not possibly be an A, and the shift of the pattern with D = -1 had to be performed in the next loop iteration (see Fig.

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Algorithms and data structures, Oberon version by Wirth N.

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