File:C grammar stmt.pdf
Summary
| 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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