Difference between revisions of "Bit.band"
From ComputerCraft Wiki
Scarfacial (Talk | contribs) (You don't need to sign articles.) |
(Rewrite) |
||
| Line 1: | Line 1: | ||
| − | {{ | + | {{lowercase}} |
| + | {{Function | ||
| + | |name=bit.band | ||
| + | |args=[[int (type)|int]] m, [[int (type)|int]] n | ||
| + | |api=bit | ||
| + | |returns=[[int]] the value of <var>m</var> AND <var>n</var> | ||
| + | |addon=ComputerCraft | ||
| + | |desc=Computes the bitwise AND of two numbers | ||
| + | |examples= | ||
| + | {{Example | ||
| + | |desc=AND the number 18 (10010) with the number 3 (00011), yielding 2 (00010) | ||
| + | |code=print(bit.band(18, 3)) | ||
| + | |output=2 | ||
| + | }} | ||
| + | }} | ||
| + | |||
== Explanation == | == Explanation == | ||
| − | + | All bit operations operate in binary numeral system [http://en.wikipedia.org/wiki/Binary_numeral_system]. 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: | |
| − | = | + | {| class="wikitable" |
| − | + | |- | |
| + | ! 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 | ||
| + | |} | ||
Revision as of 22:58, 11 March 2012
 Function bit.band | |
| Computes the bitwise AND of two numbers | |
| Syntax | bit.band(int m, int n) |
| Returns | int the value of m AND n |
| Part of | ComputerCraft |
| API | bit |
Examples
 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 |
