File:C grammar stmt.pdf

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Description
English: Shows a simplified excerpt of the formal grammar for the C programming language (left), and a derivation of a piece of C code (right, "if ( x > 9 ) { x = 0 ; y = y + 1 ; }") from the nonterminal symbol . In the derivation, each line is obtained from the previous one by application of a grammar rule. For the original C grammar, see Appendix A of the book: Brian W. Kernighan and Dennis M. Ritchie (Apr 1988) The C Programming Language, Prentice Hall Software Series (2nd ed.), Englewood Cliffs/NJ: Prentice Hall ISBN: 0131103628.
See File:C grammar stmt2.pdf for a less simplified grammar excerpt, accounting also for operator priorities.
Date
Source Own work
Author Jochen Burghardt
Other versions File:Algol grammar expr.pdf * File:Algol grammar expr svg.svg * File:C grammar stmt.pdf * File:C grammar stmt svg.svg * File:C grammar stmt2.pdf * File:C grammar stmt2 svg.svg
LaTeX source
\documentclass[12pt]{article}
\setlength{\unitlength}{1mm}
\usepackage[pdftex]{color}
\usepackage{amssymb}
\usepackage[paperwidth=240mm,paperheight=125mm]{geometry}
\setlength{\topmargin}{-36mm}
\setlength{\textwidth}{240mm}
\setlength{\textheight}{125mm}
\setlength{\oddsidemargin}{-23mm}
\setlength{\parindent}{0cm}
\pagestyle{empty}

% colors
\definecolor{cNontermNew}       {rgb}{0.00,0.00,0.75}
\definecolor{cNontermRep}       {rgb}{0.75,0.75,0.99}
\definecolor{cTermNew}          {rgb}{0.75,0.00,0.00}
\definecolor{cTermRep}          {rgb}{0.99,0.75,0.75}
\definecolor{cGrmBg}            {rgb}{0.95,0.95,0.95}

\newcommand{\NT}[1]{\textcolor{cNontermNew}{$\langle$#1$\rangle$}}
\newcommand{\nt}[1]{\textcolor{cNontermRep}{$\langle$#1$\rangle$}}
\newcommand{\TM}[1]{\textcolor{cTermNew}{\texttt{#1}}}
\newcommand{\tm}[1]{\textcolor{cTermRep}{\texttt{#1}}}

\begin{document}
\setlength{\tabcolsep}{1mm}
%\newcommand{\1}{|}     \newcommand{\2}[1]{}
\newcommand{\1}{}       \newcommand{\2}[1]{\cline{#1}}

\begin{picture}(0,0)%
\textcolor{cGrmBg}{\put(0,0){\makebox(0,0)[bl]{\rule{68.5mm}{76.7mm}}}}%
\end{picture}%
\begin{tabular}[b]{|rcl|}
\hline
\NT{Stmt} & $\rightarrow$ & \NT{Id} \TM{=} \NT{Expr} \TM{;}     \\
\NT{Stmt} & $\rightarrow$ & \TM{\{} \NT{StmtList} \TM{\}}       \\
\NT{Stmt} & $\rightarrow$ & \TM{if} \TM{(} \NT{Expr} \TM{)} \NT{Stmt}   \\
%\hline
\NT{StmtList} & $\rightarrow$ & \NT{Stmt}       \\
\NT{StmtList} & $\rightarrow$ & \NT{StmtList} \NT{Stmt} \\
%\hline
\NT{Expr} & $\rightarrow$ & \NT{Id}     \\
\NT{Expr} & $\rightarrow$ & \NT{Num}    \\
\NT{Expr} & $\rightarrow$ & \NT{Expr} \NT{Optr} \NT{Expr}       \\
%\hline
\NT{Id} & $\rightarrow$ & \TM{x}        \\
\NT{Id} & $\rightarrow$ & \TM{y}        \\
%\hline
\NT{Num} & $\rightarrow$ & \TM{0}       \\
\NT{Num} & $\rightarrow$ & \TM{1}       \\
\NT{Num} & $\rightarrow$ & \TM{9}       \\
%\hline
\NT{Optr}& $\rightarrow$ & \TM{>}       \\
\NT{Optr}& $\rightarrow$ & \TM{+}       \\
\hline
\end{tabular}
$\;\;\;\;\;\;\;$
\begin{tabular}[b]{\1c*{17}{c\1}}
\begin{tabular}[b]{\1c*{17}{c\1}}
%\hline
\multicolumn{18}{\1c\1}{\NT{Stmt}}      \\
\2{1-18}
\TM{if} & \TM{(} & \multicolumn{3}{c\1}{\NT{Expr}}   & \TM{)} & \multicolumn{12}{c\1}{\NT{Stmt}}        \\
\2{3-5}
\tm{if} & \tm{(} & \NT{Expr} & \NT{Optr} & \NT{Expr} & \tm{)} & \multicolumn{12}{c\1}{\nt{Stmt}}        \\
\2{3-3}
\tm{if} & \tm{(} & \NT{Id}   & \nt{Optr} & \nt{Expr} & \tm{)} & \multicolumn{12}{c\1}{\nt{Stmt}}        \\
\2{3-3}
\tm{if} & \tm{(} & \TM{x}    & \NT{Optr} & \nt{Expr} & \tm{)} & \multicolumn{12}{c\1}{\nt{Stmt}}        \\
\2{4-4}
\tm{if} & \tm{(} & \tm{x}    & \TM{>}    & \NT{Expr} & \tm{)} & \multicolumn{12}{c\1}{\nt{Stmt}}        \\
\2{5-5}
\tm{if} & \tm{(} & \tm{x}    & \tm{>}    & \NT{Num}  & \tm{)} & \multicolumn{12}{c\1}{\nt{Stmt}}        \\
\2{5-5}
\tm{if} & \tm{(} & \tm{x}    & \tm{>}    & \TM{9}    & \tm{)} & \multicolumn{12}{c\1}{\NT{Stmt}}        \\
\2{7-18}
\tm{if} & \tm{(} & \tm{x}    & \tm{>}    & \tm{9}    & \tm{)} & \TM{\{} & \multicolumn{10}{c\1}{\NT{StmtList}}                                                                  & \TM{\}}       \\
\2{8-17}
\tm{if} & \tm{(} & \tm{x}    & \tm{>}    & \tm{9}    & \tm{)} & \tm{\{} & \multicolumn{4}{c\1}{\NT{StmtList}}   & \multicolumn{6}{c\1}{\NT{Stmt}}                               & \tm{\}}       \\
\2{8-11}
\tm{if} & \tm{(} & \tm{x}    & \tm{>}    & \tm{9}    & \tm{)} & \tm{\{} & \multicolumn{4}{c\1}{\NT{Stmt}}       & \multicolumn{6}{c\1}{\nt{Stmt}}                               & \tm{\}}       \\
\2{8-11}
\tm{if} & \tm{(} & \tm{x}    & \tm{>}    & \tm{9}    & \tm{)} & \tm{\{} & \NT{Id} & \TM{=} & \NT{Expr} & \TM{;} & \multicolumn{6}{c\1}{\nt{Stmt}}                               & \tm{\}}       \\
\2{8-8}
\tm{if} & \tm{(} & \tm{x}    & \tm{>}    & \tm{9}    & \tm{)} & \tm{\{} & \TM{x}  & \tm{=} & \NT{Expr} & \tm{;} & \multicolumn{6}{c\1}{\nt{Stmt}}                               & \tm{\}}       \\
\2{10-10}
\tm{if} & \tm{(} & \tm{x}    & \tm{>}    & \tm{9}    & \tm{)} & \tm{\{} & \tm{x}  & \tm{=} & \NT{Num}  & \tm{;} & \multicolumn{6}{c\1}{\nt{Stmt}}                               & \tm{\}}       \\
\2{10-10}
\tm{if} & \tm{(} & \tm{x}    & \tm{>}    & \tm{9}    & \tm{)} & \tm{\{} & \tm{x}  & \tm{=} & \TM{0}    & \tm{;} & \multicolumn{6}{c\1}{\NT{Stmt}}                               & \tm{\}}       \\
\2{12-17}
\tm{if} & \tm{(} & \tm{x}    & \tm{>}    & \tm{9}    & \tm{)} & \tm{\{} & \tm{x}  & \tm{=} & \tm{0}    & \tm{;} & \NT{Id} & \TM{=} & \multicolumn{3}{c\1}{\NT{Expr}}   & \TM{;} & \tm{\}}       \\
\2{12-12}
\tm{if} & \tm{(} & \tm{x}    & \tm{>}    & \tm{9}    & \tm{)} & \tm{\{} & \tm{x}  & \tm{=} & \tm{0}    & \tm{;} & \TM{y}  & \tm{=} & \multicolumn{3}{c\1}{\NT{Expr}}   & \tm{;} & \tm{\}}       \\
\2{14-16}
\tm{if} & \tm{(} & \tm{x}    & \tm{>}    & \tm{9}    & \tm{)} & \tm{\{} & \tm{x}  & \tm{=} & \tm{0}    & \tm{;} & \tm{y}  & \tm{=} & \NT{Expr} & \NT{Optr} & \NT{Expr} & \tm{;} & \tm{\}}       \\
\2{14-14}
\tm{if} & \tm{(} & \tm{x}    & \tm{>}    & \tm{9}    & \tm{)} & \tm{\{} & \tm{x}  & \tm{=} & \tm{0}    & \tm{;} & \tm{y}  & \tm{=} & \NT{Id}   & \nt{Optr} & \nt{Expr} & \tm{;} & \tm{\}}       \\
\2{14-14}
\tm{if} & \tm{(} & \tm{x}    & \tm{>}    & \tm{9}    & \tm{)} & \tm{\{} & \tm{x}  & \tm{=} & \tm{0}    & \tm{;} & \tm{y}  & \tm{=} & \TM{y}    & \NT{Optr} & \nt{Expr} & \tm{;} & \tm{\}}       \\
\2{15-15}
\tm{if} & \tm{(} & \tm{x}    & \tm{>}    & \tm{9}    & \tm{)} & \tm{\{} & \tm{x}  & \tm{=} & \tm{0}    & \tm{;} & \tm{y}  & \tm{=} & \tm{y}    & \TM{+}    & \NT{Expr} & \tm{;} & \tm{\}}       \\
\2{16-16}
\tm{if} & \tm{(} & \tm{x}    & \tm{>}    & \tm{9}    & \tm{)} & \tm{\{} & \tm{x}  & \tm{=} & \tm{0}    & \tm{;} & \tm{y}  & \tm{=} & \tm{y}    & \tm{+}    & \NT{Num}  & \tm{;} & \tm{\}}       \\
\2{16-16}
\TM{if} & \TM{(} & \TM{x}    & \TM{>}    & \TM{9}    & \TM{)} & \TM{\{} & \TM{x}  & \TM{=} & \TM{0}    & \TM{;} & \TM{y}  & \TM{=} & \TM{y}    & \TM{+}    & \TM{1}    & \TM{;} & \TM{\}}       \\
%\hline
\end{tabular}
\end{document}

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I, the copyright holder of this work, hereby publish it under the following license:
w:en:Creative Commons
attribution share alike
This file is licensed under the Creative Commons Attribution-Share Alike 4.0 International license.
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Date/TimeThumbnailDimensionsUserComment
current20:43, 23 March 2020Thumbnail for version as of 20:43, 23 March 20201,416 × 737 (25 KB)Jochen Burghardt (talk | contribs)Uploaded own work with UploadWizard

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