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Annotation of lucent/sys/man/1/hoc, revision 1.1

1.1     ! root        1: .TH HOC 1
        !             2: .SH NAME
        !             3: hoc \- interactive floating point language
        !             4: .SH SYNOPSIS
        !             5: .B hoc
        !             6: [
        !             7: .I file ...
        !             8: ]
        !             9: .SH DESCRIPTION
        !            10: .I Hoc
        !            11: interprets a simple language for floating point arithmetic,
        !            12: at about the level of BASIC, with C-like syntax and
        !            13: functions.
        !            14: .PP
        !            15: The named
        !            16: .I files
        !            17: are read and interpreted in order.
        !            18: If no
        !            19: .I file
        !            20: is given or if
        !            21: .I file
        !            22: is
        !            23: .L -
        !            24: .I hoc
        !            25: interprets the standard input.
        !            26: .PP
        !            27: .I Hoc
        !            28: input consists of
        !            29: .I expressions
        !            30: and
        !            31: .IR statements .
        !            32: Expressions are evaluated and their results printed.
        !            33: Statements, typically assignments and function or procedure
        !            34: definitions, produce no output unless they explicitly call
        !            35: .IR print .
        !            36: .PP
        !            37: Variable names have the usual syntax, including 
        !            38: .LR _ ;
        !            39: the name 
        !            40: .L _
        !            41: by itself contains the value of the last expression evaluated.
        !            42: The variables
        !            43: .BR E ,
        !            44: .BR PI ,
        !            45: .BR PHI ,
        !            46: .BR GAMMA
        !            47: and
        !            48: .B DEG 
        !            49: are predefined; the last is 59.25..., degrees per radian.
        !            50: .PP
        !            51: Expressions are formed with these C-like operators, listed by
        !            52: decreasing precedence.
        !            53: .TP
        !            54: .B ^
        !            55: exponentiation
        !            56: .TP
        !            57: .B ! - ++ --
        !            58: .TP
        !            59: .B * / %
        !            60: .TP
        !            61: .B + -
        !            62: .TP
        !            63: .B > >= < <= == !=
        !            64: .TP
        !            65: .B &&
        !            66: .TP
        !            67: .B ||
        !            68: .TP
        !            69: .B = += -= *= /= %=
        !            70: .PP
        !            71: Built in functions are
        !            72: .BR abs ,
        !            73: .BR acos ,
        !            74: .BR asin ,
        !            75: .B atan
        !            76: (one argument),
        !            77: .BR cos ,
        !            78: .BR cosh ,
        !            79: .BR exp ,
        !            80: .BR int ,
        !            81: .BR log ,
        !            82: .BR log10 ,
        !            83: .BR sin ,
        !            84: .BR sinh ,
        !            85: .BR sqrt ,
        !            86: .BR tan ,
        !            87: and
        !            88: .BR tanh .
        !            89: The function
        !            90: .B read(x)
        !            91: reads a value into the variable
        !            92: .B x
        !            93: and returns 0 at EOF;
        !            94: the statement
        !            95: .B print
        !            96: prints a list of expressions that may include
        !            97: string constants such as
        !            98: .BR \&\&\&"hello\en" .
        !            99: .PP
        !           100: Control flow statements are
        !           101: .BR if - else ,
        !           102: .BR while ,
        !           103: and
        !           104: .BR for ,
        !           105: with braces for grouping.
        !           106: Newline ends a statement.
        !           107: Backslash-newline is equivalent to a space.
        !           108: .PP
        !           109: Functions and procedures are introduced by the words
        !           110: .B func
        !           111: and
        !           112: .BR proc ;
        !           113: .B return
        !           114: is used to return with a value from a function.
        !           115: Within a function or procedure,
        !           116: arguments are referred to as
        !           117: .BR $1 ,
        !           118: .BR $2 ,
        !           119: etc.; all other variables are global.
        !           120: .SH EXAMPLES
        !           121: .EX
        !           122: func gcd() {
        !           123:        temp = abs($1) % abs($2)
        !           124:        if(temp == 0) return abs($2)
        !           125:        return gcd($2, temp)
        !           126: }
        !           127: for(i=1; i<12; i++) print gcd(i,12)
        !           128: .EE
        !           129: .SH SOURCE
        !           130: .B /sys/src/cmd/hoc
        !           131: .SH "SEE ALSO"
        !           132: .IR bc (1),
        !           133: .IR dc (1)
        !           134: .br
        !           135: B. W. Kernighan and R. Pike,
        !           136: .I
        !           137: The Unix Programming Environment,
        !           138: Prentice-Hall, 1984
        !           139: .SH BUGS
        !           140: Error recovery is imperfect within function and procedure definitions.

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