Beginning BASIC with the ZX Spectrum

Front Matter....Pages i-xiii
Introduction....Pages 1-2
Using the keyboard....Pages 3-6
Correcting mistakes....Pages 7-8
Making a program....Pages 9-10
More about numbering lines....Pages 11-12
Editing a program....Pages 13-14
Extended mode. Using the cassette recorder....Pages 15-17
Testing your knowledge—questions on the Introduction and Units 1–5....Pages 18-20
Numeric or simple variables....Pages 21-24
String variables....Pages 25-28
Extracting parts of strings....Pages 29-31
Using the computer as a calculator....Pages 32-36
Controlling the print position....Pages 37-40
Beginnings and ends of programs....Pages 41-41
INPUT statement....Pages 42-45
Program descriptions—algorithms....Pages 46-50
Loops—using GOTO....Pages 51-55
Comparisons....Pages 56-64
More comparisons....Pages 65-76
Adding a counter....Pages 77-81
FOR-NEXT loops....Pages 82-91
READ and DATA statements....Pages 92-98
Nested loops....Pages 99-104
Graphics using PRINT statements, colour and moving graphics....Pages 105-115
Arrays—DIM statement....Pages 116-131
Subroutines....Pages 132-139
Making music....Pages 140-149
Some useful functions — RND, RAND and INT....Pages 150-154
High-resolution graphics — PLOT, DRAW, CIRCLE and INVERSE....Pages 155-169
User-defined characters....Pages 170-172
Some interesting string functions....Pages 173-176
Using the printer....Pages 177-178
Back Matter....Pages 179-205