bc
bc [options] [files]
Interactively performs arbitrary-precision arithmetic or convert
numbers from one base to another. Input can be taken from
files or read from the standard input. To exit,
type quit
or EOF
.
-c
Do not invoke dc
; compile only. (Since
bc
is a preprocessor for dc
,
bc
normally invokes dc
.)
-l
Make available functions from the math library.
bc
is a language (and compiler) whose syntax
resembles that of C. bc
consists of identifiers,
keywords, and symbols, which are briefly described here. Examples
follow at the end of this section.
An identifier is a single character, consisting of the lowercase letters a-z. Identifiers are used as names for variables, arrays, and functions. Within the same program, you may name a variable, an array, and a function using the same letter. The following identifiers would not conflict:
x
Variable x.
x
[
i
]
Element i of array x. i can range from 0 to 2047 and can also be an expression.
x
(
y
,
z
)
Call function x with parameters y and z.
ibase
, obase
, and
scale
each store a value. Typing them on a line by
themselves displays their current value. More commonly, you would
change their values through assignment. Letters A-F are treated as
digits whose values are 10-15.
ibase =
n
Numbers that are input (e.g., typed) are read as base n (default is 10).
obase =
n
Numbers displayed are in base n (default is 10).
Note: once ibase
has been changed from 10, use
digit “A” to restore
ibase ...
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