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    <p>I think it would have been better to use the term <strong><em>source-to-source translator</em></strong> instead of "preprocessors" which makes it ambiguous in meaning , but it ain't any wrong to use it either.</p> <p>Basically , A compiler is a computer program translates source code from a high-level programming language to a lower level language (e.g., assembly language or machine code).But the document in the question says :</p> <blockquote> <p>Historically, compilers for many languages, including C++ and Fortran, have been <strong>implemented</strong> as “<strong>preprocessors</strong>” which emit another high level language such as C.</p> </blockquote> <p>As per this description , it can be said that earlier , the compilers were <strong>implemented</strong> as <em>source-to-source translator</em> . A translator is also a form of preprocessor but its different from the preprocessor used in a program. </p> <blockquote> <p>A translator is a computer program that translates a program written in a given programming language into a functionally equivalent program in a different language.</p> </blockquote> <p>Now, coming to <em>preprocessor used in a program</em> , lets take an example :</p> <pre><code>#include &lt;stdio.h&gt;// a PREPROCESSOR directive </code></pre> <p>A preprocessor is a program that processes a source file before the main compilation takes place,( similar to a translator ) <strong>but the difference lies in the fact that HERE it handles directives whose names begin with #</strong>.</p> <p>Here <code>#include</code> is a directive. This directive causes the preprocessor to add the contents of the <code>stdio.h</code> file to your program.This is a typical preprocessor action: adding or replacing text in the source code before it’s compiled.</p>
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    1. POWant a clean explanation for GCC preprocessors
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    1. US0decimal0
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    1. COAfter reading all answers here, now I got two points: 1. preprocessors here means source-to-source translator 2. GCC doesn't use this way today, generates machine codes directly
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      1. USDean Chen
    2. CO@DeanChen yeah !! there you go :)
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    3. CONice! where did you find this detail? link may I have?
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      1. USGrijesh Chauhan
 

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