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preprocessor directive in c | macros in c

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. c pre processor in hindi,c preprocessor,c preprocessor directive in hindi,preprocessor directive in hindi,use of preprocessor,#include and #define,directive in c language,c programming in hindi,advantages of preprocessor directive,advantages of c pre-processor,merits of preprocessor in hindi,c preprocessor,macro,directives,preprocessor ,preprocessor directives in c,#define,#include,#if,#else, aasaan padhaai,c programming