# Type UNSIGNED-BYTE

### Supertypes

unsigned-byte, signed-byte, integer, rational, real, number, t

### Description

The atomic type specifier unsigned-byte denotes the same type as is denoted by the type specifier `(integer 0 *)`.

Abbreviating.

### Compound Type Specifier Syntax

• unsigned-byte [s | *]

### Compound Type Specifier Description

This denotes the set of non-negative integers that can be represented in a byte of size s (bits). This is equivalent to `(mod m)` for `m = 2s`, or to `(integer 0 n)` for `n = 2s - 1`. The type unsigned-byte or the type `(unsigned-byte *)` is the same as the type `(integer 0 *)`, the set of non-negative integers.

### Notes

The type `(unsigned-byte 1)` is also called bit.

\issue{REAL-NUMBER-TYPE:X3J13-MAR-89}