Calc normally displays numbers in decimal (**base-10** or **radix-10**)
notation. Calc can actually display in any radix from two (binary) to 36.
When the radix is above 10, the letters `A`

to `Z`

are used as
digits. When entering such a number, letter keys are interpreted as
potential digits rather than terminating numeric entry mode.

The key sequences `d 2`, `d 8`, `d 6`, and `d 0` select
binary, octal, hexadecimal, and decimal as the current display radix,
respectively. Numbers can always be entered in any radix, though the
current radix is used as a default if you press `#` without any initial
digits. A number entered without a `#` is *always* interpreted
as decimal.

To set the radix generally, use `d r` (`calc-radix`

) and enter
an integer from 2 to 36. You can specify the radix as a numeric prefix
argument; otherwise you will be prompted for it.

Integers normally are displayed with however many digits are necessary to
represent the integer and no more. The `d z` (`calc-leading-zeros`

)
command causes integers to be padded out with leading zeros according to the
current binary word size. (See section Binary Number Functions, for a discussion of
word size.) If the absolute value of the word size is w, all integers
are displayed with at least enough digits to represent @c{$2^w-1$}
(2^w)-1 in the
current radix. (Larger integers will still be displayed in their entirety.)

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