Campbell-scientific CR3000 Micrologger Manuel d'utilisateur télécharger pdf (Page 152)

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Section 7. Installation

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Table 22. 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

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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. 152) 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

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Campbell-scientific CR3000 Micrologger Manuel d'utilisateur Page 152

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