INTRODUCTION

You may miss out all the REM statements except the first two. These statements are just to help you understand how the program works.

You can also omit the spaces between the line number and the start of the statement. However BBC BASIC is rather pedantic about spaces elsewhere, so I advise you to copy the rest of the statements exactly. In particular, there may be no spaces between TAB and the first bracket. Also, to be safe, always put a space before words OR and AND. Any spaces within quotation marks must also be copied exactly.

Remember also to put in all the punctuation exactly as it appears. If you miss out a comma, the program may not work. If the program still does not work after you have corrected the errors reported by the computer, check the following. See whether you have confused any zeroes for the letter O, or alternatively ones and the letter I. Check, also, that you have not missed any program lines. This is easily done if program lines look similar. Most program line numbers go up by ten at a time, so read your line numbers to find this one.

You may find some of the procedures useful, and you are welcome to put these in any programs you write for your own use. You may not, of course, sell or give them away.

I hope you enjoy the book, and that your brain is not teased too heavily.