Answer Posted / pooja gupta

# is a symbol used by the developer of c compiler designer
to define the preprocessor directives. Pre-processor word
means that the header file following #include is already
processed and their is no chance of it containing any
errors or flats. User can directly include the header file
in their program.
The #include use in 2 ways.
1. #include<filename> and
2. #include"filename".
in #include<filename>
if the file is not found there, the compiler checks the
source header directory.If the file is not still found
there,the pre-processor checks the current directory....

in #include"filename"
If the file is not found there the compiler checks the
compile include directory.If the file is still not found
there the pre-procesor checks the source header
directory.

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