Campbell Scientific CR1000 Measurement and Control System - Manual (Page 147)

Section 7. Installation
147
Table 20. Logical Expression Examples
If X >= 5 AND Z = 2 then Y = 0
Sets Y = 0 only if both X >= 5 and Z = 2 are true.
If 6 then Y = 0.
If 6 is true since 6 (a non-zero number) is returned, so Y is set to 0 every time the statement is executed.
If 0 then Y = 0.
If 0 is false since 0 is returned, so Y will never be set to 0 by this statement.
Z = (X > Y).
Z equals -1 if X > Y, or Z will equal 0 if X <= Y.
The NOT operator complements every bit in the word. A Boolean can be FALSE (0 or all bits set to 0) or TRUE (-1 or all bits set to 1).
“Complementing” a Boolean turns TRUE to FALSE (all bits complemented to 0).
Example Program
'(a AND b) = (26 AND 26) = (&b11010 AND &b11010) =
'&b11010. NOT (&b11010) yields &b00101.
'This is non-zero, so when converted to a
'BOOLEAN, it becomes TRUE.
Public a As LONG
Public b As LONG
Public is_true As Boolean
Public not_is_true As Boolean
Public not_a_and_b As Boolean
BeginProg
a = 26
b = a
Scan (1,Sec,0,0)
is_true = a AND b 'This evaluates to TRUE.
not_is_true = NOT (is_true) 'This evaluates to FALSE.
not_a_and_b = NOT (a AND b) 'This evaluates to TRUE!
NextScan
EndProg
7.7.3.9.5 String Expressions
CRBasic allows the addition or concatenation of string variables to variables of all
types using & and + operators. To ensure consistent results, use & when
concatenating strings. Use + when concatenating strings to other variable types.
CRBasic example String and Variable Concatenation
(p. 147)
demonstrates
CRBasic code for concatenating strings and integers.
CRBasic Example 23. String and Variable Concatenation
'Declare Variables
Dim Wrd(8) As String * 10
Public Phrase(2) As String * 80
Public PhraseNum(2) As Long
'Declare Data Table
DataTable (Test,1,-1)
DataInterval (0,15,Sec,10)
'Write phrases to data table "Test"
Sample (2,Phrase,String)
EndTable