Bitwise Right Shift Operator - MACROMEDIA FLASHLITE2 ACTIONSCRIPT-LANGUAGE Reference

>> bitwise right shift operator
expression1 >> expression2
Converts
expression1
to the right by the number of places specified by the integer that results from
expression1
the conversion of
expression2
preserve the sign of the original
most significant bit (the bit farthest to the left) of
most significant bit is 1. Shifting a value right by one position is the equivalent of dividing by
2 and discarding the remainder.
Floating-point numbers are converted to integers by discarding any digits after the decimal
point. Positive integers are converted to an unsigned hex value with a maximum value of
4294967295 or 0xFFFFFFFF; values larger than the maximum have their most significant
digits discarded when they are converted so the value is still 32-bit. Negative numbers are
converted to an unsigned hex value via the two's complement notation, with the minimum
being -2147483648 or 0x800000000; numbers less than the minimum are converted to two's
complement with greater precision and also have the most significant digits discarded.
The return value is interpreted as a two's complement number with sign, so the return value
will be an integer in the range -2147483648 to 2147483647.
Availability: ActionScript 1.0; Flash Lite 2.0
Operands
expression1 : Number
expression2 : Number
Returns
- The result of the bitwise operation.
Number
Example
The following example converts 65535 to a 32-bit integer and shifts it 8 bits to the right:
var x:Number = 65535 >> 8;
trace(x); // outputs 255
The following example shows the result of the previous example:
var x:Number = 255;
This is because 65535 decimal equals 1111111111111111 binary (sixteen 1s),
1111111111111111 binary shifted right by 8 bits is 11111111 binary, and 11111111 binary
is 255 decimal. The most significant bit is 0 because the integers are 32-bit, so the fill bit is 0.
132 ActionScript language elements
and to 32-bit integers, and shifts all the bits in
expression2
. Bits that are shifted off the right end are discarded. To
expression
- A number or expression to be shifted right.
- A number or expression that converts to an integer from 0 to 31.
, the bits on the left are filled in with 0 if the
is 0, and filled in with 1 if the
expression1