BitArShift: Difference between revisions
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{{Shared function}} | {{Shared function}} | ||
This functions performs an arithmetic shift on the integer '''value''' by integer '''n''' positions. In | This functions performs an arithmetic shift on the integer '''value''' by integer '''n''' positions. In an ''arithmetic shift'', zeros are shifted in to replace the discarded bits. In a ''right arithmetic'' shift, the [https://en.wikipedia.org/wiki/Sign_bit sign bit] is shifted in on the left, thus preserving the sign of the operand. | ||
See [https://en.wikipedia.org/wiki/Bitwise_operation#Arithmetic_shift Bitwise operation] for more details. | See [https://en.wikipedia.org/wiki/Bitwise_operation#Arithmetic_shift Bitwise operation] for more details. | ||
Latest revision as of 01:10, 22 February 2016
This functions performs an arithmetic shift on the integer value by integer n positions. In an arithmetic shift, zeros are shifted in to replace the discarded bits. In a right arithmetic shift, the sign bit is shifted in on the left, thus preserving the sign of the operand. See Bitwise operation for more details.
Syntax
int bitArShift ( int value, int n )
Required arguments
- value: The value you want to perform the arithmetic shift on.
- n: The amount of positions to shift the value by.
Returns
Returns the arithmetic shifted value as integer.
Example
Click to collapse [-]
ClientThis example adds the clientside command /arshift [value] [positions = 1], which will print the result from the function bitArShift.
function getNumberAsBitString(value)
if type(value) ~= 'number' then
return false
else
local binary = ''
for field = 31, 0, -1 do
binary = binary .. bitExtract(value, field)
if field % 4 == 0 then
binary = binary ..' '
end
end
return binary
end
end
addCommandHandler('arshift',
function (command, value, positions)
if type(value) ~= 'string' or value:len() == 0 then
return outputChatBox('* Syntax: /arshift [value] [positions = 1]')
end
if type(positions) ~= 'string' or positions:len() == 0 then
positions = 1
end
local result = bitArShift(tonumber(value), tonumber(positions))
local binary = getNumberAsBitString(result)
outputChatBox('* Decimal: '.. result ..', Binary: '.. binary)
end
)
If you trigger the command with /arshift 0xF0 4 and /arshift 0xF0 -4 you will receive as response:
* Decimal: 15, Binary: 0000 0000 0000 0000 0000 0000 0000 1111 * Decimal: 3840, Binary: 0000 0000 0000 0000 0000 1111 0000 0000