Chapter 6 RAPID!
RAPID! syntax
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Example: boolExp := NOT boolExp | boolExp AND | OR |
XOR boolExp
This means by words: A boolean expression is either the negation of another
boolean expression, or two boolean expressions linked with one of the three
operators: AND, OR, and XOR.
Please note that this is only an example. The complete definition of Boolean
expressions is a bit more complex.
Program lines Each RAPID! program consists of a number of program lines. Those lines contain
the BASIC statements and have the following structure:
[label:] statement [: statement]
label:
A program line starts with an optional label. In contrary to AUTORUN
programs, line numbers are not required.
With RAPID!, labels are mainly used as branch targets.
A label must always end with a colon.
statement
A statement is a BASIC command.
Important notes
– A program line always needs to be terminated by a carriage return (CR). This
symbol is equivalent to pushing the ‘Enter’ key at the end of a program line.
– It is not possible to show the maximum of 254 characters in one line on-
screen. Therefore, a program line may stretch out over several lines on-
screen. To indicate that the program line is continued, put a blank followed
by an underscore ‘
_’ and then push Enter to start a new line.
Example: print "RAPID!" _
;" Program"
– There must not be empty lines between continued program lines.
– An underscore at the end of a ‘REM’ command will cause a syntax error.
– The debugger will only highlight the first screen line of continued program
lines.
– As mentioned before, a program line may contain up to 254 characters and
several statements. However, we strongly recommend to use only one state-
ment per program line wherever possible. Several statements in a program
line lower the readability of the program code and usually make servicing a
program quite tricky.
NOTE
Notations can also be nested. This makes them suitable for expressing even
complicated syntax.
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