bc
bc [options
] [files
]
Interactively performs arbitrary-precision arithmetic or converts
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
Don’t invoke dc
; compile only.
(Because bc
is a preprocessor for
dc
, bc
normally invokes
dc
.)
-l
Make available functions from the math library.
-q
Quiet, don’t print welcome message.
-s
Don’t use extensions to POSIX bc
.
-v
Print version number.
-w
Warn if extensions are used.
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 ...
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