This chapter will introduce a wide variety of topics related to computer software and programming languages.
We will discuss some of the history of computer languages, and describe some of the varieties of languages.
Then we will discuss the operation of language processing programs that build executable code from
source code written by programmers. All these discussions will be incomplete—they are intended only to
introduce the topics. However, we hope to impart a sense of the variety of approaches to computer programming,
the historical variety of languages, and the basic mechanisms of compilers and interpreters.
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