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GNU Emacs Calc 2.02 Manual

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7.7.1 Radix Modes

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 8.7 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 (2^w)-1 in the current radix. (Larger integers will still be displayed in their entirety.)

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