C Preprocessor

1. What is preprocessor command?
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   A preprocessor is a text substitution tool and it tells to compiler to do required pre-processing before the actual compilation.
   All preprocessor commands begins with hash symbol(#).
   
   
2. What is the default header file that comes with the C compiler?
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   stdio.h
   
   
3. What is the difference between #include<filename> and #include "filename"?
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   #include<filename> - It searches directories at pre-designated by the compiler.
   #include "filename" - It searches in the same directory as the file containing the directive.
   
   
4. What is header file?
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   A header file is a file with extension .h which contains C function declarations and macro definitions to be shared between several source files.
   
   

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