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• If the file to be included doesn't exist, the preprocessor flashes an error message.
• Preprocessor directive can be used only on a macro that has been earlier
• There exists a way to prevent the same file from getting twice in the same program.
• In a macro call the control is passed to the macro.
• A header file contains macros, structure declaration and function prototypes.
• The preprocessor can trap simple errors like missing declarations, nested comments or mismatch of braces.
• A preprocessor directive is a message from compiler to a linker.
• Once preprocessing is over and the program is sent for the compilation the macros are removed from the expanded source code.
• A macro must always be defined in capital letters.
• Will it result in to an error if a header file is included twice?