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Discussion in 'C' started by ghostrider12345, Mar 12, 2013.

  1. ghostrider12345

    ghostrider12345 New Member

    Why does the following line of code generate error as " pasting / and / doesnot generate a valid preprocessing token"? Can someone please help

    #define comment /##/
    int main()
    comment printf("hello");
    return 0;
  2. shabbir

    shabbir Administrator Staff Member

    Comment is /**/ and not /##/ BTW
  3. ghostrider12345

    ghostrider12345 New Member

    I know that Sir this question deals with pasting / and / which surely forms a single line comment
  4. shabbir

    shabbir Administrator Staff Member

    So why you think /##/ would give you output as //?
  5. ghostrider12345

    ghostrider12345 New Member

    Its a preprocessor token pasting operator which joins its operands to make a valid token!!!
  6. shabbir

    shabbir Administrator Staff Member


    It says clearly and I quote
  7. aroraaisha

    aroraaisha New Member

    # this is symbol of preprocessor.
    Ex- #include<stdio.h>
    void main()

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