MACROMEDIA FLASH MX 2004-ACTIONSCRIPT LANGUAGE, Справочник

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>>= (bitwise right shift and assignment) 89
>>= (bitwise right shift and assignment)
Availability
Flash Player 5.
Usage
expression1 >>= expression2
Parameters
expression1
A number or expression to be shifted right.
expression2
A number or expression that converts to an integer from 0 to 31.
Returns
A 32-bit integer.
Description
Operator (bitwise compound assignment); this operator performs a bitwise right-shift operation
and stores the contents as a result in
expression1
.
The following two expressions are equivalent:
A >>= B
A = (A >> B)
For more information, see “Operator precedence and associativity” in Using ActionScript in Flash .
Example
The following commented code uses the bitwise right shift and assignment (
>>=
) operator.
function convertToBinary(numberToConvert:Number):String {
var result:String = "";
for (var i = 0; i<32; i++) {
// Extract least significant bit using bitwise AND
var lsb:Number = numberToConvert & 1;
// Add this bit to the result string
result = (lsb ? "1" : "0")+result;
// Shift numberToConvert right by one bit, to see next bit
numberToConvert >>= 1;
}
return result;
}
trace(convertToBinary(479));
// Returns the string 00000000000000000000000111011111
// This string is the binary representation of the decimal
// number 479
See also
>> (bitwise right shift)