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Obfuscate the regexps to strip off the IBM compiler's copyright banners. I don't want bots scanning github to think they're real copyright notices because that could cause real problems.
author David A. Holland
date Mon, 13 Jun 2022 00:40:23 -0400
parents 13d2b8934445
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1 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2//EN">
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2 <HTML>
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3 <HEAD>
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4 <TITLE>Four Function Calculator</TITLE>
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5 </HEAD>
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6
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7
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8 <BODY BGCOLOR="#ffffff" BACKGROUND="tilbl6h.gif"
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9 TEXT="#000000" LINK="#0033CC"
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10 VLINK="#CC0033" ALINK="#CC0099">
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11
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12 <P>
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13 <IMG ALIGN="right" SRC="../images/agrsl6c.gif" ALT="AnaGram"
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14 WIDTH=124 HEIGHT=30 >
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15 <BR CLEAR="all">
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16 Back to <A HREF="../index.html">Index</A>
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17 <P>
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18 <IMG ALIGN="bottom" SRC="../images/rbline6j.gif" ALT="----------------------"
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19 WIDTH=1010 HEIGHT=2 >
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20 <P>
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21
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22 <H1>Four Function Calculator</H1>
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23
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24 <IMG ALIGN="bottom" SRC="../images/rbline6j.gif" ALT="----------------------"
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25 WIDTH=1010 HEIGHT=2 >
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26 <P>
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27 <H2>Introduction</H2>
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28 <P>
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29 <tt>ffcalc.syn</tt> implements a simple four function
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30 calculator. The
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31 calculator has 52 registers, labeled 'a' through 'z' and 'A'
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32 through 'Z'. <tt>ffcalc</tt> evaluates arithmetic expressions and
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33 assignment statements and prints the results. The
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34 expressions may contain '<CODE>+</CODE>', '<CODE>-</CODE>',
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35 '<CODE>*</CODE>', and '<CODE>/</CODE>' operators as
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36 well as parentheses. In addition, <tt>ffcalc</tt> supports
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37 the free
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38 use of white space and C style comments in the input. It
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39 also includes syntax error handling, including a diagnostic
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40 message, and resynchronization.
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41 <P>
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42 <tt>ffcalcmx.syn</tt> is a simple variation on
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43 <tt>ffcalc.syn</tt>. The only
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44 difference between the two grammars is that <tt>ffcalcx</tt> uses a
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45 deliberately ambiguous grammar for expressions, with
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46 precedence statements to resolve the ambiguities.
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47 <P>
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48
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49 <H2>Building FFCALC</H2>
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50 To build a working copy of <tt>ffcalc</tt>, you need to
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51 carry out the following steps:
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52 <UL>
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53 <LI> 1. Run Anagram and build a parser for <tt>ffcalc.syn</tt>. </LI>
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54 <LI> 2. Using your C compiler, compile and link <tt>ffcalc.c</tt>. </LI>
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55 </UL>
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56 <P>
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57
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58 <H2>Running FFCALC</H2>
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59 <tt>ffcalc</tt> reads expressions and assignment statements from
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60 stdin. You may either type input directly, or provide input
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61 by using file redirection. The file <tt>test.ffc</tt> has been
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62 provided as a sample.
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63 <P>
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64 Run <tt>ffcalc</tt> from the command line and type an
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65 arithmetic expression or assignment
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66 statement to be evaluated. <tt>ffcalc</tt> will accept addition,
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67 subtraction, multiplication and division operations, as well
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68 as unary negation, using floating point arithmetic. It
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69 respects the conventional order of operations and allows the
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70 use of parentheses to override the natural order of
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71 computation. You may use spaces, tabs, and C-style comments
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72 freely. You may use variable names consisting of a single
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73 upper or lower case letter.
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74 <P>
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75 Each expression or assignment statement must be terminated
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76 by a newline. Note that <tt>ffcalc</tt>, unlike
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77 <tt>rcalc</tt>, does not explicitly check
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78 for division by zero.
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79 </P>
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80
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81 <BR>
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82
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83 <IMG ALIGN="bottom" SRC="../images/rbline6j.gif" ALT="----------------------"
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84 WIDTH=1010 HEIGHT=2 >
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85 <P>
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86 <IMG ALIGN="right" SRC="../images/pslrb6d.gif" ALT="Parsifal Software"
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87 WIDTH=181 HEIGHT=25>
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88 <BR CLEAR="right">
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89 <P>
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90 Back to <A HREF="../index.html">Index</A>
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91 <P>
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92 <ADDRESS><FONT SIZE="-1">
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93 AnaGram parser generator - examples<BR>
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94 Four Function Calculator<BR>
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95 Copyright &copy; 1993-1999, Parsifal Software. <BR>
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96 All Rights Reserved.<BR>
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97 </FONT></ADDRESS>
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98
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99 </BODY>
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100 </HTML>
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101