68 lines
2.1 KiB
Markdown
68 lines
2.1 KiB
Markdown
# Bits Library
|
|
|
|
Functions in the Bits library.
|
|
|
|
### @parent td/language
|
|
|
|
The binary numeral system represents numeric values using values 0 and 1. This is how almost all modern computers store data. Each 0 or 1 digit is called a binary digit, or bit for short.
|
|
|
|
The Bits library includes functions for bit-level manipulation of integers. In the [Touch Develop editor](/javascript/editor), click `bits` to see the following bit functions:
|
|
|
|
## Bitwise and, or, and xor functions
|
|
|
|
#### Syntax
|
|
|
|
bits `->` *and/or/xor* uint32 (x : [Number](/types/number), y : [Number](/types/number)) *returns* [Number](/types/number)
|
|
|
|
#### Parameters
|
|
|
|
* x - an unsigned 32 bit integer [Number](/types/number)
|
|
* y - another unsigned 32 bit integer [Number](/types/number)
|
|
|
|
### and uint32
|
|
|
|
performs bitwise AND; returns `1` at position i if both bits *x[i]* and *y[i]* are `1`, otherwise returns `0`.
|
|
|
|
### or uint32
|
|
|
|
performs bitwise OR; returns `1` at position *i* if either bit *x[i]* or *y[i]* is `1`, otherwise returns `0`.
|
|
|
|
### xor uint32
|
|
|
|
performs bitwise exclusive XOR; returns `1` at position *i* if *x[i]=1 and y[i]=0* or *x[i] = 0 and y[i] =1*; returns `0` otherwise
|
|
|
|
## Rotate left and rotate right
|
|
|
|
Rotate bits to the left or the right, by the specified number of positions.
|
|
|
|
#### Syntax
|
|
|
|
bits `->` rotate left unint32 (x : [Number](/types/number), bits : [Number](/types/number)) *returns* [Number](/types/number)
|
|
|
|
bits `->` rotate right unint32 (x : [Number](/types/number), bits : [Number](/types/number)) *returns* [Number](/types/number)
|
|
|
|
#### Parameters
|
|
|
|
* x - [Number](/types/number);
|
|
* bits - [Number](/types/number);
|
|
|
|
## Shift left and shift right
|
|
|
|
Shift bits to the left or the right, by the specified number of positions.
|
|
|
|
#### Syntax
|
|
|
|
bits `->` shift left unint32 (x : [Number](/types/number), bits : [Number](/types/number)) *returns* [Number](/types/number)
|
|
|
|
bits `->` shift right unint32 (x : [Number](/types/number), bits : [Number](/types/number)) *returns* [Number](/types/number)
|
|
|
|
#### Parameters
|
|
|
|
* x - [Number](/types/number);
|
|
* bits - [Number](/types/number);
|
|
|
|
### See also
|
|
|
|
[statements and operators](/javascript/statements), [math functions](/javascript/math), [Number](/types/number)
|
|
|