Minor fixes in 1990/dds/README.md
Format fixes in README.md including making unordered lists to make the rendered content easier to read and follow. I've also become aware of a problem with the way the author formatting was done in recent days in the README.md files that now have to all be fixed: there needs to be spaces after each line or else the author information will be one line which is definitely wrong. I think the only one I got this right is, ironically or not :-), my own entries, namely because I wanted to make sure that they looked okay (I did 'make sure' that some of the others did too but that was to changes that I was unsure of .. ironically leaving out one I should have known but probably just forgot). Thus many pull requests will be made unless I do it in a mass fix which I suppose is possible to save time.
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# Best Language Tool
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Diomidis Spinellis
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Imperial College, University of London
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Myrsinis 1
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GR-145 62 Kifissia
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Greece
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Diomidis Spinellis
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Imperial College, University of London
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Myrsinis 1
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GR-145 62 Kifissia
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Greece
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## To build:
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@@ -16,26 +16,28 @@ you Yusuke!
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[Cody Boone Ferguson](/winners.html#Cody_Boone_Ferguson) removed the erroneous
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prototype to `fopen()` and made this use `fgets()` instead of `gets()` to make
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it safer and to prevent a potentially alarming warning at linking or runtime.
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Thank you Cody for your assistance!
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it safer and to prevent a potentially alarming warning at compiling and/or
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linking and/or runtime. Thank you Cody for your assistance!
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## To run
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./dds
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```sh
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./dds
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```
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## Try:
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Give the following lines as input:
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OLD LANDER.BAS
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RUN
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```
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OLD LANDER.BAS
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RUN
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```
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NOTE: this is case sensitive.
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## Judges' comments:
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Be sure not to run out of fuel!
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@@ -43,40 +45,53 @@ Be sure not to run out of fuel!
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This is the DDS-BASIC Interpreter (Version 1.00).
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Immediate commands:
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### Immediate commands:
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RUN LIST NEW OLD filename
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BYE SAVE filename
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- RUN
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- LIST
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- NEW
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- OLD filename
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- BYE
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- SAVE filename
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Program commands:
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### Program commands:
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variable names a to z variables initialized to 0 on RUN
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FOR var = exp TO exp NEXT variable
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GOSUB exp RETURN
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GOTO exp IF exp THEN exp
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INPUT variable PRINT string
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PRINT exp var = exp
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REM any text END
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- variable names a to z
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- variables initialized to 0 on RUN
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- FOR var = exp TO exp
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- NEXT variable
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- GOSUB exp
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- RETURN
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- GOTO exp
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- IF exp THEN exp
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- INPUT variable
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- PRINT string
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- PRINT exp
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- var = exp
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- REM any text
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- END
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Expressions (ranked by precedence):
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### Expressions (ranked by precedence):
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Bracketed expressions
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number (leading 0 for octal, 0x for hex, else decimal), variable
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Unary -
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* /
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+ -
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= <>
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> <
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<= >=
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(* and + are also used for boolean AND and boolean OR)
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Boolean expressions evaluate to 0 for false and 1 for true
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- Bracketed expressions
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- number (leading 0 for octal, 0x for hex, else decimal), variable
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- Unary -
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- `*` `/`
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- `+` `-`
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- `=` `<>`
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- `>` `<`
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- `<=` `>=`
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Editing:
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(`*` and `+` are also used for boolean AND and boolean OR)
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Boolean expressions evaluate to 0 for false and 1 for true.
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### Editing:
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- Line editor using line re-entry.
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- A line number with nothing following it, deletes the line.
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Input format:
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### Input format:
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- Free format positioning of tokens on the line.
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- No space is allowed before the line number.
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@@ -85,38 +100,33 @@ Input format:
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- ALL INPUT MUST BE UPPERCASE.
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Limits:
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### Limits:
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Line numbers 1-10000
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Line length 999 characters
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FOR nesting 26
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GOSUB 999 levels
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Program Dynamically allocated
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Expressions -32768 - 32767 for 16 bit machines,
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-2147483648 - 2147483647 for 32 bit machines
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Error checking / error reports:
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- Line numbers 1-10000
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- Line length 999 characters
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- FOR nesting 26
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- GOSUB 999 levels
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- Program Dynamically allocated
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- Expressions -32768 - 32767 for 16 bit machines, -2147483648 - 2147483647 for 32 bit machines
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### Error checking / error reports:
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No error checking is performed.
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It might dump core if a syntax or semantic error is encountered.
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### Hosting Environment:
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Hosting Environment:
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ANSI C, traditional K&R C or OSF ANDF ASCII or EBCIDIC character set 48K bytes
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memory.
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ANSI C, traditional K&R C or OSF ANDF
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ASCII or EBCIDIC character set
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48K bytes memory
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The Speed of DDS-BASIC Interpreter (Version 1.00) relative to Microsoft Advanced
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BASIC 3.31 is approximately 60%.
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The Speed of DDS-BASIC Interpreter (Version 1.00). relative to
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Microsoft Advanced BASIC 3.31 is Approximately 60%.
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The code size could be further reduced by doing ugly things like
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not declaring the return type of functions, not freeing memory,
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#defining define, and joining lines. In its present 1536 character
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form the program is reasonably portable (it may fail to run in a
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tagged object architecture) and nicely formatted (it fits in an
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80*25 screen).
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The code size could be further reduced by doing ugly things like not declaring
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the return type of functions, not freeing memory, #defining define, and joining
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lines. In its present 1536 character form the program is reasonably portable
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(it may fail to run in a tagged object architecture) and nicely formatted (it
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fits in an `80*25` screen).
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## Copyright and CC BY-SA 4.0 License:
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