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14'), but in this case the bounds must be omitted as they are determined by the number of characters on the right-hand side. After'[] char title= "AMAZING"', the lower bound of 'title' is fixed at 1 and the upper bound fixed at 7, and 'title[5] ', say, refers to "I". 'title' cannot be changed but 'path' can, although any assignment of less than 5 characters to 'path' will have to be padded out with blank characters and any longer path will require a new declaration. Flexible multiples come to the rescue.

TRAVERSING A MAZE: MULTIPLE VALUES 35 The algorithm should also be tested on data where there is no route out, on illegal data and on a maze where several dead ends are encountered before a path is found. To improve the efficiency and readability of this program drastically, requires the use of procedures and this is our next topic. We also show how to define operators like 'plusab' between strings if this is not implemented. Problems for Chapter 3 1. Write a program whose input is a sequence of integers, all less than 400, and whose output is their equivalent in Roman numerals.

A unit like 'if x > 0 then 1/x fi' with no else part has a void result. 4 Use case in a procedure with parameters a,b,c to print the real roots of ax 2 + bx + c = 0, or to print a message if the roots are not real. To avoid the two-dimensional multiple 'monthchecker' in the program we could, if the implementation allows, use a multiple of multiples, '[1:12) [1:3) char monthcheck' or, better, '[1:12) string monthch'. An alternative is to use bytes, a basic type of character-string explained in chapter 7.

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