doubt in strcutures

This is a discussion on doubt in strcutures within the C Programming forums, part of the General Programming Boards category; hello, i have a doubt regarding the declaration of structures. i am using 2 structures both of which have head ...

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    doubt in strcutures

    hello,
    i have a doubt regarding the declaration of structures.

    i am using 2 structures both of which have head pointer one of which is local and the other one is global.how do i refer them.i tried addressing both of them as head but this gives an error.can someone please help me out.

    eg:
    Code:
    Struct A
    {
    int i;
    char *a;
    struct A *next;
    }A;
    struct A *head = NULL;(local head)
    
    struct B
    {
    char *name;
    int sign;
    B *c,*c_tail;
    struct B *next;
    }B;
    struct B *head = NULL;(global head)
    Regards,
    cutelucks

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    Algorithm Dissector iMalc's Avatar
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    Probably the best thing to do is simply don't give them the same name.

    Also, if English is not your first language, never use the word "doubt", because you'll never get it right!
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  3. #3
    C++まいる!Cをこわせ!
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    Next time, please indent your code.
    I know of no way to access two variables of the same name in C since it generally doesn't support overloading.
    Quote Originally Posted by Adak View Post
    io.h certainly IS included in some modern compilers. It is no longer part of the standard for C, but it is nevertheless, included in the very latest Pelles C versions.
    Quote Originally Posted by Salem View Post
    You mean it's included as a crutch to help ancient programmers limp along without them having to relearn too much.

    Outside of your DOS world, your header file is meaningless.

  4. #4
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    Quote Originally Posted by cutelucks View Post
    hello,
    i have a doubt regarding the declaration of structures.

    i am using 2 structures both of which have head pointer one of which is local and the other one is global.how do i refer them.i tried addressing both of them as head but this gives an error.can someone please help me out.
    That's not a "doubt", that's a question (although you forgot to put a ? at the end and you should put a couple spaces between each sentence).

    A "doubt" is a statement, not a question. For example:
    "I doubt I'm going to get that job I wanted." -- means you don't think you'll get the job.
    "Do you think I'll get the job I applied for?" -- This is a question that you're asking someone.

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    C++まいる!Cをこわせ!
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    But generally it is A-OK to say "I have a doubt about <insert something here>". Depends on the context, of course.
    Quote Originally Posted by Adak View Post
    io.h certainly IS included in some modern compilers. It is no longer part of the standard for C, but it is nevertheless, included in the very latest Pelles C versions.
    Quote Originally Posted by Salem View Post
    You mean it's included as a crutch to help ancient programmers limp along without them having to relearn too much.

    Outside of your DOS world, your header file is meaningless.

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    hii,
    i am sorry for the gramatical errors.i will not repeat it in future.
    i still dint understand the answer to my question.do u mean i should use head for one and head1(or something like that for the second structure)?

    i tried using that but i get error that head1 is no known.please help me with this.

    Regards,
    cutelucks

  7. #7
    Aia
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    You are struggling with the scope of the variable head.

    struct A *head = NULL;(local head)
    struct B *head = NULL;(global head)

    These two variables have the same identifier. You can get away with it if you define them inside different scope of visibility. The local head has precedence over the global. The program can see only one at a time; the local struct A *head.
    Solution: Make variables of different distinctive identifiers.
    BTW. You have many syntax errors in you structure declarations.

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    Algorithm Dissector iMalc's Avatar
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    Quote Originally Posted by Elysia View Post
    But generally it is A-OK to say "I have a doubt about <insert something here>". Depends on the context, of course.
    Please don't reinforce bad English. It is very dificult to find someone who has posted on this site saying that they have "a doubt" and then proceeds to describe their actual doubt, instead of asking a question! Most people get it wrong, and you've just given them reason to care less.
    Anyway, lets stay on topic from now.

    You would have to change the declaration AND the place you use it in order to make your code compile.
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