\input webmac
\centerline{\bf Hello World}
\vskip .5cm
This is a very simple example of the WEB system.

\M1. First, we define a text to be displayed.

\Y\P$\4\X1:Content to print\X\S$\6
\.{\'Hello,\ Literate\ Programming!\'}\par
\U3.\fi

\M2. This is the mainprogram of the Pascal program.
An expression surrounded by $\langle$ and $\rangle$
is substituted by its definition.

\Y\P$\\{Program}\\{HelloWorld}(\\{output})$;\6
\&{begin} \37\X3:Do something inside a program\X\6
\&{end}.\par
\fi

\M3. You can define an identifier after reference in WEB language.
\Y\P$\4\X3:Do something inside a program\X\S$\6
$\\{writeLn}(\X1:Content to print\X)$\par

\U2.\fi

\inx
\:\\{HelloWorld}, 2.
\:\\{output}, 2.
\:\\{Program}, 2.
\:\\{writeLn}, 3.
\fin
\:\X1:Content to print\X
\U3.
\:\X3:Do something inside a program\X
\U2.
\con