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>Expressions</A
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><P
>A GCL program consists of a series of expressions. An expression is
typically a GCL command built up out of function calls.
Expressions can be
entered interactively, at the command prompt, or can be entered from
files, via the <TT
CLASS="LITERAL"
>Include["filename"]</TT
> directive (see the section
on including files). </P
><P
>Expressions are terminated by an end-of-line character (the carriage
return) at a point where all brackets, braces, and quotes are matched
(cloed). Expressions can be explicitly continued on additional lines
by using the continuation character, <TT
CLASS="LITERAL"
>\</TT
>.</P
><P
>Comments can be
included in GCL statements by preceeding the comments with the
characters <TT
CLASS="LITERAL"
>//</TT
>. Anything after the <TT
CLASS="LITERAL"
>//</TT
>
and before a
linefeed is ignored by the GCL interpreter.</P
><P
>Some statements can lead to computations which may take a long time to
complete. A control-C, typed at the console, is used to halt
execution of the GCL and return to the command prompt. Note that the
effect of a control-C may not always be immediate, as the control-C is
only polled for at convenient stages during computation.</P
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