What will the pre-processor do for a program?

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Chetan Santha

Professional Tutor with 15 years of experience.

The pre processor takes a look at your source code just before it goes off to the compiler, does a little formatting, and carries out any instructions you have given it. Each # command that the preprocessor encounters results in a modification to the source code in some way. Let’s take a look at them...
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The pre processor takes a look at your source code just before it goes off to the compiler, does a little formatting, and carries out any instructions you have given it. Each # command that the preprocessor encounters results in a modification to the source code in some way. Let’s take a look at them briefly in turn, and then we’ll see what goes on behind the scenes. read less
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Mathematics & Computer Science since 20 years

Pre-processor is the predefined definitions of specific functions. So , programmer don't need to define while calling similar functions
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We have to include that file to use some ready functions in that particular header file.
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The preprocessor takes a look at your source code just before it goes off to the compiler, does a little formatting, and carries out any instructions you have given it.
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Pre-processor, as it suggests, does something before hand. They help in generating code in lesser lines. The lines defined for pre-processing are done during compilation period, which is the reason why it can be better than functions in terms of call overhead because macros are done during compile...
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Pre-processor, as it suggests, does something before hand. They help in generating code in lesser lines. The lines defined for pre-processing are done during compilation period, which is the reason why it can be better than functions in terms of call overhead because macros are done during compile time at one go. read less
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Freelance technical trainer / consultant (Embedded systems, Automation / Scripting) : C, Linux, Embedded systems, python, perl, tcl

It takes source file as input, works on all the prerpocessor directives in that file and produces an intermediate file.
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