how do you resolve this error?

This is a discussion on how do you resolve this error? within the C Programming forums, part of the General Programming Boards category; warning: ‚struct ExprNode‚ declared inside parameter list util.c:10: warning: its scope is only this definition or declaration, which is probably ...

  1. #1
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    how do you resolve this error?

    warning: ‚struct ExprNode‚ declared inside parameter list
    util.c:10: warning: its scope is only this definition or declaration, which is probably not what you want


    I have something like this:

    Code:
    void print(struct ExprNode *root, int nLevel){
    
    ............
    ........
    
    }
    and struct ExprNode is on another file called tree.h and I have included that file in my .h file, but why this weird error? how to fix it?

  2. #2
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    Sounds like you have a typo - or you are using C++, so you shouldn't have "struct" in the function definition, perhaps?

    Alternatively, there may be macros at play.

    --
    Mats
    Compilers can produce warnings - make the compiler programmers happy: Use them!
    Please don't PM me for help - and no, I don't do help over instant messengers.

  3. #3
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    So how is that struct declared in the tree.h file? The compiler thinks you are declaring it in the function parameter list.

  4. #4
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    here's the struct located in the tree.h file:

    Code:
    struct ExprNode {
    	ExprType type;
    	
    	struct ExprNode *next;//used for parameter exprList r;
    	struct ExprNode *prior;//used for  parameter list
    
    
    	struct ExprNode *parent;//or the son exp
    	struct ExprNode *left; //used for any expression element, array,
    	struct ExprNode *right;
    
    	struct ExprNode *StmtDomain[4];
    	
    	//it is used for statment and function body
    
    	
    	char* name;// name for function and Identfier
    	
    	int n;
    	
    	int nodeSeen;
    	int tempVarCount;
    	int rootLabelCount;
    	
    	
    	/*static void print(ExprNode *p,int n);
    	static void printTab(int n);//print n tabs*/
    
    	
    };

  5. #5
    and the hat of wrongness Salem's Avatar
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    What are the first 10 lines of util.c

    Do you include tree.h ?

    Does tree.h have #ifndef GUARD #endif constructs?

    Are those constructs unique to every single include file, or did you just copy/paste them?

    Oh, and you're writing C++ at this point.
    If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
    If at first you don't succeed, try writing your phone number on the exam paper.
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  6. #6
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    Do you include tree.h ?

    Does tree.h have #ifndef GUARD #endif constructs?

    yes it does

    and I don't understand what you mean by those contructs unique to every single include file

  7. #7
    C++まいる!Cをこわせ! Elysia's Avatar
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    Are you a C+ dev?
    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.

  8. #8
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    I am actually a C programmer, and not familiar at all with C++.. I just need to fix this code somehow.. can you guys tell me why it's a C++ program? maybe it's because I am compiling it with gcc that's why it's complaining?

  9. #9
    C++まいる!Cをこわせ! Elysia's Avatar
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    Because structs cannot contain functions...
    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.

  10. #10
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    so how would you translate such thing to C? are you trying to say the reverse? functions cannot contain struct as arguments?

  11. #11
    Banned master5001's Avatar
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    Use g++. Or fix this and make it C code.

  12. #12
    Banned master5001's Avatar
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    Declare that function outside the struct.

  13. #13
    C++まいる!Cをこわせ! Elysia's Avatar
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    Quote Originally Posted by master5001 View Post
    Use g++. Or fix this and make it C code.
    Then it would be C+ code
    There are trickeries and hacks that can make it possible, but otherwise than that, there is no solution because C is a procedural language. What you are looking at is OOP. C++, Java, C#, etc-
    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.

  14. #14
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    okay lets just fix this code then.. do you compile a C++ file the same as a C file? using gcc -o util.o util.c , something like that?

  15. #15
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    Quote Originally Posted by Elysia View Post
    Then it would be C+ code
    There are trickeries and hacks that can make it possible, but otherwise than that, there is no solution because C is a procedural language. What you are looking at is OOP. C++, Java, C#, etc-
    I love my C+ code. Besides, he is copying from a C++ program and trying to integrate code into his C code. I am just trying to make life easier. But she is right... Do a half-assed job and expect half-assed results.

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