\Wbegin[]{article{1em{1em{demo0.cts{{\&{\|{\\{\\{\\{\@}{\.}{\.

% — Beginning of user’s limbo section —

\WN1. EXAMPLE. The ‘\.{
’~begins a major module or section (one for which an entry is made in the table of contents). We are now in the \TeX\ part of the section, in which we can type arbitrary \TeX\ to explain what goes on in the remainder of the section.

The next statement introduces the definition part of this section. \modlabel{FirstMod % Attach an identifying name to this section.

\WY\WP\WMd$\\{PRINT\WIN2{0(\\{word) $\5 $\{printf(\.{"\%s\1\ world.\\n",\39\#\\{word){$\5 \WC{ An example of a \.{WEB macro def’n. They are compatible with ANSI~C, but have extensions (not illustrated here) that will be explained later. Long comments that extend over more than one line can be written like this, in the C commenting style. \WY\par \WY${\WP \\{main\WIN1{0(\,)$\1\6 ${\{$\6 \\{PRINT\WIN2{0(\\{Hello);\5 \WC{ Bullets as subscripts indicate that the name is defined in the current section. \6 ${\\{init\WIN1{3(\,);{$\5 \WC{ Example of a function call. The subscript is inserted automatically, and indicates in which section the function is defined. \6 \WX2:Do the computations\X \X;\5 \WC{ Use of named modules makes the code readable. Again, the section number where this module is defined is inserted automatically. \6 \\{PRINT\WIN2{0(\\{Goodbye);\6 ${\$\2\WY\par \fi % End of module 1

\WM2. The ‘\.{@\ ’~begins a minor section. (No entry is made in the table of contents.) Here the named fragment \WCD{ \WX2:Do the computations\X \X used in the previous module is actually defined. (The definition part of this section is empty.) The name of this module is ‘Do the computations’; it can be abbreviated (using an ellipsis) for simplicity in the source because it appeared earlier in full; however, when it’s printed the full name will be used for readability.

\WY\WP\4\4\WX2:Do the computations\X \X${\WS{$\6 ${\{{$\5 \WC{ Put arbitrary C code here. \6 $\,\{$\WY\par \WU section~1.\fi % End of module 2

\WM3. In general, function names don’t carry as much information as do named modules, since a module name can be arbitrarily long and complicated. But function calls have their place as well, as described later.

This function is actually accreted to the unnamed module begun in \WEBsection{FirstMod. Examine the source listing to see how the section number in the last sentence was generated automatically through the use of \FWEB’s \TeX\ macros \.{\\modlabel and \.{\\WEBsection.

\WY\WP \&{void \1\\{init\WIN1{0(\&{void)\2\1\6 ${\{\,\$\2\WY\par \fi % End of module 3

\WN4. INDEX. It’s customary to make the index the last major module. \fi % End of module 4

\input demo0.ndx \input demo0.mds

\Winfo{"fweave ./demo0 -zdemos.sty -=demo0.tex" {"./demo0.web" {(none) {C

\Wcon

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