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What is Preprocessor?

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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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Related Questions

What is the structure of a C program?
A basic structure of a C program typically consists of: 1. **Preprocessor Directives:** These are lines of code that begin with a `#` symbol. They are instructions to the compiler to include certain...
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What is the best IDE for C and C++ development?
If you're a student then Turbo C++ is best for C and C++ program + inbuilt C/C++ Graphics Function If you're a professional or working then Netbeans for C/C++ or Code:: Blocks is Best.
Balakrishnasingh
Why does execution of a program in C/C++/Java start from only main?
Main function is calling the other functions of he program and compiler gets this direction while Compiling the code. If it does not find main function then it will also not find the other functions in the code. So, main is required in C program.
Isha
What are important topics in C language?
Variables and handling datatypes · Structures · Functions · Pointers · Arrays · Conditional statements and switches · File handling · System
Everest
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What is the fee for learning C Language?
In C lang course ,there is not only basics it also having whole package to complete the task and course.cost may be it's depends upon the institute n teaching level
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