.Dd December 30, 2020
.Dt BIT 1
.Os
.
.Sh NAME
.Nm bit
.Nd a calculator
.
.Sh SYNOPSIS
.Nm
.
.Sh DESCRIPTION
.Nm
is an integer calculator.
Its syntax resembles that of C expressions,
with the following changes:
.
.Bl -bullet
.It
Underscores are allowed in integer literals.
.It
The
.Sy 0b
prefix is used for binary literals.
.It
The
.Sy ->
operator is used for arithmetic shift.
.It
The unary
.Sy &
operator is equivalent to
.Sy (1 << x) - 1 .
.It
The postfix operators
.Sy K ,
.Sy M ,
.Sy G ,
.Sy T
are used as constant multipliers.
.It
The postfix operator
.Sy $
is of lowest precedence and is equivalent to
wrapping the preceding expression in parentheses.
.It
Single-letter (lower case) variables
can be assigned.
The variable
.Sy _
stores the previous result.
.El
.
.Sh SEE ALSO
.Xr operator 7