本文介绍了Tcl，一种动态编程语言，以其跨平台、开源和易扩展性著称。Tcl与Tk结合，提供了丰富的图形用户界面开发工具。文章涵盖了Tcl/Tk的基本用途，如原型开发、脚本和GUI，以及开始学习的步骤，包括安装和运行解释器。通过实例展示了Tcl/Tk与Wxwidgets创建GUI的比较，突显了其代码简洁的优势。
一、是什么(What)？
TCL（Tool Command Language）是一种脚本语言，一种易于学习的动态程序语言。特点是：跨平台、开源、易扩展。
Tcl Developer Site 站点对Tcl的描述：
Tcl (Tool Command Language) is a very powerful but easy to learn dynamic programming language, suitable for a very wide
range of uses, including web and desktop applications, networking, administration, testing and many more. Open source and
business-friendly, Tcl is a mature yet evolving language that is truly cross platform, easily deployed and highly extensible.
Tk 是一个跨平台、开放源代码的图形用户界面开发工具。Tk与Tcl一样都是由C函数库实现的。
Tcl Developer Site 站点对Tk的描述：
Tk is a graphical user interface toolkit that takes developing desktop applications to a higher level than conventional approaches.
Tk is the standard GUI not only for Tcl, but for many other dynamic languages, and can produce rich, native applications that run
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