preprocessor directive in C , | include directive ,define directive ,preprocessor directives

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#preprocessordirectives
#includepreprocessor
#definepreprocessor
#c
#C++
Preprocessor Directives
Commands that give instructions to the C-compiler
Given at the beginning of the source code
Compiler directives
Begins with a # sign followed by a word “include” or “define”
Does not end with semicolon (;)
Processed before compiling source code
Preprocessor Part of the C compiler that takes actions on the preprocessor directives
Does some processing before the actual compilation process starts
“include” directive is used to include header file in the C program
include directive
define directive
The ‘include’ Preprocessor Directive

Used to include the specified header file in the program
Means that this preprocessor directive tells the preprocessor to insert the definitions of standard functions (used in the program) into C program from a standard library
The ‘define’ Preprocessor Directive

Another important preprocessor directive
Used to define a constant constant macro
Constant macro identifier, which is assigned a particular constant value
Value of identifier remains constant during the execution of program
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