By Peter Morse
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Additional info for The Essential guide to Timex/Sinclair home computers: The only book you'll ever need to become an expert at the Timex/Sinclair 1000 and 2000
45 44 • SECTION E: IMPROVING THE PROGRAM E1: Adding Comments REM The REM statement is used for adding comments to a program. All REM statements are ignored by the computer when the program is RUN. These comment statements are for the users' benefit only. They contain information in the text of the program which explains what the program is doing. For example: REM **THIS PROGRAM ADDS TWO NUMBERS KEYED IN AND PRINTS THE RESULTS** Notice the use of the asterisks to separate the text from the instruction.
To get this, key CAPS SHIFT and the 4 key to get INV. VIDEO. Then input the asterisk. e. normal black on When you've got it all keyed in, LIST it to check it through again. Check the first screenful, then (on a ZX81) LIST 170 to get the rest of the program (with a line that was on the first screenful to keep your place). LLIST it on the printer. Key RUN then NEWLINE (ENTER) to play. The keys 5 and 8 move you left and right respectively across the top of the screen. They are chosen for the direction of the arrows printed on them.
We give a selection of standard flowchart symbols here. There are additional ones, but their usage varies. The conventions of use should be followed if you wish other people to understand your flowcharts. For your own use, in analysing programs, you may be less exact, but not less systematic. Flow in a program can be illustrated by a selection of blobs and rectangles only, given that the lines of flow are correctly given, and the right words are written in the blobs! Doing this is all right for yourself, but not if your flowcharts are to be comprehensible to others.
The Essential guide to Timex/Sinclair home computers: The only book you'll ever need to become an expert at the Timex/Sinclair 1000 and 2000 by Peter Morse