bc(1) - Plan 9 from User Space

From adc93f6097615f16d57e8a24a256302f2144ec4e Mon Sep 17 00:00:00 2001 From: rsc Date: Fri, 14 Jan 2005 17:37:50 +0000 Subject: cut out the html - they're going to cause diffing problems. --- man/man1/bc.html | 272 ------------------------------------------------------- 1 file changed, 272 deletions(-) delete mode 100644 man/man1/bc.html (limited to 'man/man1/bc.html') diff --git a/man/man1/bc.html b/man/man1/bc.html deleted file mode 100644 index c4f7e7ba..00000000 --- a/man/man1/bc.html +++ /dev/null @@ -1,272 +0,0 @@ - -bc(1) - Plan 9 from User Space - - - - -

BC(1) BC(1) -

-
-

NAME
- -
- - bc – arbitrary-precision arithmetic language
- -
-

SYNOPSIS
- -
- - bc [ −c ] [ −l ] [ −s ] [ file ... ]
- -
-

DESCRIPTION
- -
- - Bc is an interactive processor for a language that resembles C - but provides arithmetic on numbers of arbitrary length with up - to 100 digits right of the decimal point. It takes input from - any files given, then reads the standard input. The −l argument - stands for the name of an arbitrary precision math library. The - −s -argument suppresses the automatic display of calculation results; - all output is via the print command. -
- - The following syntax for bc programs is like that of C; L means - letter a-z, E means expression, S means statement.
- Lexical
- -
- - -
- - comments are enclosed in /* */ -newlines end statements
- -
- -
- Names
- -
- - -
- - simple variables: L
- array elements: L[E] -The words ibase, obase, and scale - -
- -
- Other operands
- -
- - -
- - arbitrarily long numbers with optional sign and decimal point.
- (E) - sqrt(E) - length(E) -number of significant decimal digits
- scale(E) -number of digits right of decimal point
- L(E,...,E) -function call
- -
- -
- Operators
- -
- - -
- - +    −    *    /    %    ^ (% is remainder; ^ is power)
- ++    −− - ==    <=    >=    !=    <    > - =    +=    −=    *=    /=    %=    ^= - -
- -
- Statements
- -
- - -
- - E
- { S ; ... ; S } - print E
- if ( E ) S
- while ( E ) S
- for ( E ; E ; E ) S
- null statement
- break - quit - "text" - -
- -
- Function definitions
- -
- - -
- - define L ( L , ... , L ){ - auto L , ... , L
- S ; ... ; S
- return E -
- - } - -
- -
- Functions in    −l math library
- -
- - -
- - s(x)sine
- c(x)cosine
- e(x)exponential
- l(x)log
- a(x)arctangent
- j(n, x) -Bessel function
- -
- - -
- -
- All function arguments are passed by value. -
- - The value of an expression at the top level is printed unless - the main operator is an assignment or the −s command line argument - is given. Text in quotes, which may include newlines, is always - printed. Either semicolons or newlines may separate statements. - Assignment to scale influences the number of digits to - be retained on arithmetic operations in the manner of dc(1). Assignments - to ibase or obase set the input and output number radix respectively. - -
- - The same letter may be used as an array, a function, and a simple - variable simultaneously. All variables are global to the program. - Automatic variables are pushed down during function calls. In - a declaration of an array as a function argument or automatic - variable empty square brackets must follow the array name. -
- - Bc is actually a preprocessor for dc(1), which it invokes automatically, - unless the −c (compile only) option is present. In this case the - dc input is sent to the standard output instead.
- -
-

EXAMPLE
- -
- - Define a function to compute an approximate value of the exponential. - Use it to print 10 values. (The exponential function in the library - gives better answers.) -
- - scale = 20 - define e(x) { - - - - auto a, b, c, i, s - a = 1 - b = 1 - s = 1 - for(i=1; 1; i++) { - - - - a *= x - b *= i - c = a/b - if(c == 0) return s - s += c - - - } - - - } - for(i=1; i<=10; i++) print e(i) - -
-

FILES
- -
- - /usr/local/plan9/lib/bclib mathematical library
- -
-

SOURCE
- -
- - /usr/local/plan9/src/cmd/bc.y - -
-

SEE ALSO
- -
- - dc(1), hoc(1)
- -
-

BUGS
- -
- - No &&, ||, or ! operators. -
- - A for statement must have all three Es. -
- - A quit is interpreted when read, not when executed.
- -
- -

- - -

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	- - - -

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