What is Preprocessor?

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Rajeev Singh

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Preprocessor is a a computer program that modifies data to conform with the input requirements of another program.
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Freelance technical trainer / consultant (Embedded systems, Automation / Scripting) : C, Linux, Embedded systems, python, perl, tcl

Preprocessor is a software which is executed before compilation (or you can say as the first step in the compilation). It converts source file to an intermediate file, processing all the preprocessor directives such as #define, #include etc. You can execute gcc -E SourceFile.c to see output of the pr...
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Preprocessor is a software which is executed before compilation (or you can say as the first step in the compilation). It converts source file to an intermediate file, processing all the preprocessor directives such as #define, #include etc. You can execute gcc -E SourceFile.c to see output of the preprocessor. read less
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The C preprocessor is a macro processor that is used automatically by the C compiler to transform your program before actual compilation. It is called a macro processor because it allows you to define macros, which are brief abbreviations for longer constructs.
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preprocessor from the word itself mean prior or before processing takes place it is not a part of compiling but off course a step to processing it started with a predirector with # symbol which point out the beggining of the program.
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