Campbell CR6 Series, Operator'S Manual

Page: 185 / 690

Section 7. Installation
185
7.6.3 Programming Syntax
7.6.3.1 Program Statements
CRBasic programs are made up of a series of statements. Each statement
normally occupies one line of text in the program file. Statements consist of
instructions, variables, constants, expressions, or a combination of these.
"Instructions" are CRBasic commands. Normally, only one instruction is
included in a statement. However, some instructions, such as If and Then , are
allowed to be included in the same statement.
Lists of instructions and expression operators can be found in CRBasic Editor
Help
(p. 183).
7.6.3.1.1 Multiple Statements on One Line
Multiple short statements can be placed on a single text line if they are separated
by a colon ( : ). This is a convenient feature in some programs. However, in
general, programs that confine text lines to single statements are easier for
humans to read.
In most cases, regarding statements separated by : as being separate lines is safe.
However, in the case of an implied
EndIf
, CRBasic behaves in what may be an
unexpected manner. In the case of an If...Then...Else...EndIf statement, where
the EndIf is only implied, it is implied after the last statement on the line. For
example:
If A then B : C : D
does not mean:
If A then B (implied EndIf ) : C : D
Rather, it does mean:
If A then B : C : D (implied EndIf )
7.6.3.1.2 One Statement on Multiple Lines
Long statements that overrun the
CRBasic Editor
page width can be continued on
the next line if the statement break includes a space and an underscore ( _ ). The
underscore must be the last character in a text line, other than additional white
space.
Note CRBasic statements are limited to 512 characters, whether or not a
line continuation is used.
Examples:
Public A, B, _
C,D, E, F
If (A And B) _
Or (C And D) _
Or (E And F) then ExitScan