Need of # in header file declaration

Replies

• 

  rahul69

  # is a preprocessor directive. I think it helps the Linker to link the required libraries. It tells the preprocessing required to be done before compilation. It has other uses also as in
  # define x 30 where x is replaced by 30 everywhere in the program. Hope this helps 😀
• 

  anmolsingh6161

  its not important to include libraries in ur program..................
• 

  vinci

  I dont agree with Apprentice.
  Libraries are an important part of c programs and we need to include them to us e components insie them
  for example in a c++ program,without #include
  how can we use cin and cout?
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  PraveenKumar Purushothaman

  # is the syntax of the compiler to understand it as a directive, where #include and #define are pre-processor directives! 😀