Difference between revisions of "Bit.band"

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m (Use type template)
m (Changed nonexistent type int to type number.)
 
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{{Function
 
{{Function
 
|name=bit.band
 
|name=bit.band
|args={{Type|int}} m, {{Type|int}} n
+
|args={{Type|number}} m, {{Type|number}} n
 
|api=bit
 
|api=bit
|returns={{Type|int}} the value of <var>m</var> AND <var>n</var>
+
|returns={{Type|number}} the value of <var>m</var> AND <var>n</var>
 
|addon=ComputerCraft
 
|addon=ComputerCraft
 
|desc=Computes the bitwise AND of two numbers
 
|desc=Computes the bitwise AND of two numbers

Latest revision as of 01:36, 12 July 2013


Grid Redstone.png  Function bit.band
Computes the bitwise AND of two numbers
Syntax bit.band(number m, number n)
Returns number the value of m AND n
Part of ComputerCraft
API bit

Examples

Grid paper.png  Example
AND the number 18 (10010) with the number 3 (00011), yielding 2 (00010)
Code
print(bit.band(18, 3))
Output 2


Explanation

All bit operations operate in binary numeral system [1]. An AND operation between two bits yields a 1 if the bits are both 1 and a 0 if either of the bits is 0. This function produces an output by computing the AND of each bit of its two inputs independently. So, for the example above:

Bit index: 4 3 2 1 0
Input 1 (18): 1 0 0 1 0
Input 2 (3): 0 0 0 1 1
Calculation: 3 has a 0 Both 0 Both 0 Both 1 18 has a 0
Output (2): 0 0 0 1 0