2 * *****************************************************************************
4 * SPDX-License-Identifier: BSD-2-Clause
6 * Copyright (c) 2018-2020 Gavin D. Howard and contributors.
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9 * modification, are permitted provided that the following conditions are met:
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36 usage: %s [options] [file...]
38 bc is a command-line, arbitrary-precision calculator with a Turing-complete
39 language. For details, use `man %s`.
41 This bc is compatible with both the GNU bc and the POSIX bc spec. See the GNU bc
42 manual (https://www.gnu.org/software/bc/manual/bc.html) and bc spec
43 (http://pubs.opengroup.org/onlinepubs/9699919799/utilities/bc.html)
46 This bc has three differences to the GNU bc:
48 1) Arrays can be passed to the builtin "length" function to get the number of
49 elements currently in the array. The following example prints "1":
54 2) The precedence of the boolean "not" operator (!) is equal to that of the
55 unary minus (-), or negation, operator. This still allows POSIX-compliant
56 scripts to work while somewhat preserving expected behavior (versus C) and
57 making parsing easier.
58 3) This bc has many more extensions than the GNU bc does. For details, see the
61 This bc also implements the dot (.) extension of the BSD bc.
65 -e expr --expression=expr
67 Run "expr" and quit. If multiple expressions or files (see below) are
68 given, they are all run before executing from stdin.
72 Run the bc code in "file" and exit. See above as well.
76 Turn scale, ibase, and obase into stacks. This makes the value of each be
77 be restored on returning from functions. See the man page for more
82 Print this usage message and exit.
86 Force interactive mode.
90 Use predefined math routines:
92 s(expr) = sine of expr in radians
93 c(expr) = cosine of expr in radians
94 a(expr) = arctangent of expr, returning radians
95 l(expr) = natural log of expr
96 e(expr) = raises e to the power of expr
97 j(n, x) = Bessel function of integer order n of x
99 This bc may load more functions with these options. See the manpage for
104 Disable the prompt in interactive mode.
108 Don't print version and copyright.
112 Error if any non-POSIX extensions are used.
116 Warn if any non-POSIX extensions are used.
120 Print version information and copyright and exit.