A Preprocessor Directive is considered as a built-in predefined function or macro that acts as a directive to the compiler and it gets executed before the actual C Program is executed.
Sandhya Answered question June 26, 2023
Preprocessing directives are lines in your program that start with # . The # is followed by an identifier that is the directive name.
For example, #define is the directive that defines a macro. Whitespace is also allowed before and after the # .
Sandhya Answered question June 26, 2023