Bit Shift Operators

The bit shift operators (>> or <<) perform an arithmetic bit shift operation on a numeric expression.

Syntax

Variable = Numeric Expression >> Amount

The following program shows the use of the right bit shift operator (>>).

Public NumEx AS LONG, Shift(8) AS LONG

 

BeginProg
  NumEx=2048
  Scan (1,Sec,3,0)
    Shift(1)=NumEx >> 1
    Shift(2)=NumEx >> 2
    Shift(3)=NumEx >> 3
    Shift(4)=NumEx >> 4
    Shift(5)=NumEx >> 5
    Shift(6)=NumEx >> 6
    Shift(7)=NumEx >> 7
    Shift(8)=NumEx >> 8
  NextScan
EndProg

Remarks

>> shifts the bit pattern to the right.

<< shifts the bit pattern to the left.

The Amount argument is the number of bits to shift left or right. Amount must be an integer.

This datalogger uses the big-Closedendian Endianness refers to byte order. With the little-endian format, bytes are ordered with the least significant byte (the "little end") first. With the big-endian format, bytes are ordered with the most significant byte ("big end") first. The CR300, GRANITE 9, and GRANITE 10 dataloggers use the little-endian format. The CR800, CR1000, CR3000, CR6, CR1000X, and GRANITE 6 use the big-endian format. Byte order when sending string variables as serial data is identical in big-endian and little-endian CSI dataloggers. Only numeric values sent as multiple bytes require attention to big-endian and little-endian issues. system for storing multi-byte data.

NOTE: The ClosedLong Data type used when declaring a variable as an integer. data type is a signed integer. Shifting the bit pattern to the right maintains the same sign (i.e., the most significant bit is maintained as a 1 if the number is a negative). An AND operation can be performed to strip the unwanted bits for an unsigned integer.