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Practical Programming in Tcl & Tk, Third Edition
By Brent B. Welch

Table of Contents
Preface


Typographic Conventions

The more important examples are set apart with a title and horizontal rules, while others appear in-line. The examples use courier for Tcl and C code. When interesting results are returned by a Tcl command, those are presented below in oblique courier. The => is not part of the return value in the following example.

expr 5 + 8
=> 13

The courier font is also used when naming Tcl commands and C procedures within sentences.

The usage of a Tcl command is presented in the following example. The command name and constant keywords appear in courier. Variable values appear in courier oblique. Optional arguments are surrounded with question marks.

set varname ?value?

The name of a program is in italics:

xterm


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