conditional compilation in c | #if #ifdef in c | macros in c

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The C preprocessor is a micro processor that is used by compiler to transform your code before compilation.
#define: used to substitute a preprocessor using macro.
#include: used to include a certain header from another file.
#undef: used to undefine a certain preprocessor macro.
#ifdef: It returns true if a certain macro is defined.
#ifndef: It returns true if a certain macro is not defined.
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