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; To compile as C++, I believe you need to use g++. I really have no problems with you trying to ...

  1. #16
    C++まいる!Cをこわせ! Elysia's Avatar
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    To compile as C++, I believe you need to use g++.
    I really have no problems with you trying to extend C beyond what it was designed for, but I think at some point you really should decide to go C or C++, since they are two different beasts and people will likely frown at such a mix, not to mention you would probably not get away with it in a job.
    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.

  2. #17
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    so something like g++ -g util.o util.c would work?

  3. #18
    and the hat of wrongness Salem's Avatar
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    > and I don't understand what you mean by those contructs unique to every single include file
    Well tree.h might be
    #ifndef TREE_H_INCLUDED
    #define TREE_H_INCLUDED
    // some stuff
    #endif



    But if some other file (say util.h), also has (by some mistake)
    #ifndef TREE_H_INCLUDED
    #define TREE_H_INCLUDED
    // some stuff
    #endif

    Then including util.h before tree.h will make everything in tree.h invisible.
    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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  4. #19
    C++まいる!Cをこわせ! Elysia's Avatar
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    Quote Originally Posted by -EquinoX- View Post
    so something like g++ -g util.o util.c would work?
    Eh, no idea, I do not compile manually. Someone else will peek into your problem in due time, I guess, and provide you an answer.
    Cannot be of help there. Sorry.
    But you can always try.
    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.

  5. #20
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    well, here's tree.h if you want to see it:

    Code:
    #ifndef tree_h
    #define tree_h
    
    typedef enum{
    	T_EXPR_INTCON,
    	T_EXPR_STRINGCON,
    	T_EXPR_CHARCON,//
    
    	T_EXPR_VARIABLE,
    	T_EXPR_ARRAY,
    	T_EXPR_FUNCALL,
    
    	T_EXPR_ADD,
    	T_EXPR_SUB,
    	T_EXPR_MUL,
    	T_EXPR_DIV,
    	T_EXPR_UMINUS,
    
    	T_EXPR_REOP_GT,
    	T_EXPR_REOP_LT,
    	T_EXPR_REOP_LE,
    	T_EXPR_REOP_GE,
    	T_EXPR_REOP_NE,
    	T_EXPR_REOP_EQ,
    
    	T_EXPR_NOT,
    	T_EXPR_AND,
    	T_EXPR_OR,
    
    	//T_FUNCAL_ENTRY,//could be in expr, also could be in stamtment
    
    	T_TYPE_INT,
    	T_TYPE_ARRAY_INT,
    	T_TYPE_CHAR,
    	T_TYPE_ARRAY_CHAR,
    	T_TYPE_VOID,// an fun could has no return, thus has void, it is necessary to check error, like a+f(b), but f has no return,
    	T_TYPE_BOOL,
    	T_TYPE_STRINGCON,
    	T_EXTERN,
    
    	T_NOT_FOUND,//return when look up a variables not found,
    
    
    	T_STMT_IF,
    	T_STMT_IFELSE,
    	T_STMT_WHILE,
    	T_STMT_FOR,
    	T_STMT_RETURN,
    	T_STMT_FUNCALL,
    	T_STMT_ASSIGN_VAR,
    	T_STMT_ASSIGN_ARRAY,
    
    
    	// include the array,
    	// to think, if it is array, it should have a
    	// arrayExp point to an Integer constant
    	T_DCL_VAR_INT,
    	T_DCL_VAR_CHAR,
    
    	T_DCL_ARRAY_INT,
    	T_DCL_ARRAY_CHAR,
    
    	T_DCL_ARRAYLEN,
    
    	T_DCL_EXTERN_VAR_INT,
    	T_DCL_EXTERN_VAR_CHAR,
    
    	T_DCL_EXTERN_ARRAY_INT,
    	T_DCL_EXTERN_ARRAY_CHAR,
    
    
    	T_DCL_FUN_VOID,
    	T_DCL_FUN_INT,
    	T_DCL_FUN_CHAR,
    	T_DCL_FUN_STRING,
    
    
    	T_DCL_FUN_EXTERN_VOID,
    	T_DCL_FUN_EXTERN_INT,
    	T_DCL_FUN_EXTERN_CHAR,
    
    	T_FUN_BODY_INT,//used
    	T_FUN_BODY_CHAR,//used
    	T_FUN_BODY_VOID,//used
    
    	T_PARAM_VAR_INT,
    	T_PARAM_VAR_CHAR,
    	T_PARAM_ARRAY_INT,
    	T_PARAM_ARRAY_CHAR,
    	T_PARAM_VOID,
    
    	T_SYM_INT,
    	T_SYM_CHAR,
    	T_SYM_VOID
    
    
    	} ExprType;
    
    
    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*/
    
    	
    };
    
    
    #endif

  6. #21
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    here's util.h

    Code:
    #include <stdlib.h>
    #include <stdio.h>
    #include <string.h>
    #include "tree.h"
    #include "threeaddress.h"
    
    void printTab(int );
    void print(struct ExprNode *, int );
    and part of util.c:

    Code:
    void printTab(int n)
    {
    	int i;
    	for(i=0;i<n;i++)
    	{
    		printf("\t");
    	}
    	printf("&#37;d:",n);
    }
    
    void print(struct ExprNode *root, int nLevel)
    {
    	printTab(nLevel);
    	if(root==NULL) {printf("NULL\n"); return;}
    	switch (root->type)
    	{
    		case T_EXPR_INTCON:
    			printf("%d\n",root->n);
    			if(root->next!=NULL) print(root->next,nLevel);
    			break;
    		case T_EXPR_STRINGCON:
    			printf("\" %s \"\n",root->name);
    			if(root->next!=NULL) print(root->next,nLevel);
    			break;
    		case T_EXPR_CHARCON://
    			printf("'%c'\n",root->n);
    			if(root->next!=NULL) print(root->next,nLevel);
    			break;
    
    		case T_EXPR_VARIABLE:
    			printf("%s\n",root->name);
    			if(root->next!=NULL) print(root->next,nLevel);
    			break;
    
    		case T_EXPR_ARRAY:
    			printf("%s[]\n",root->name);
    			print(root->left,nLevel+1);
    			break;
    		case T_EXPR_FUNCALL:
    			printf("%s()\n",root->name);
    			print(root->left,nLevel+1);
    			break;
    		case T_EXPR_ADD:
    			printf("+\n");
    			print(root->left,nLevel+1);
    			print(root->right,nLevel+1);
    			break;
    		case T_EXPR_SUB:
    			printf("-\n");
    			print(root->left,nLevel+1);
    			print(root->right,nLevel+1);
    			break;

  7. #22
    Banned master5001's Avatar
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    Quote Originally Posted by master5001 View Post
    Declare that function outside the struct.
    That devilishly clever dude had a good point. Whoever he is.

  8. #23
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    what do you mean declare the function outside the struct? the struct is taken as an parameter arguments inside the function parameter..

  9. #24
    C++まいる!Cをこわせ! Elysia's Avatar
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    Code:
    struct foo { void foo2(); } // Function declared inside struct
    struct foo3 {};
    void foo2(); // Function declared outside struct
    The first is only valid in C++.
    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. #25
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    Quote Originally Posted by Elysia View Post
    Code:
    struct foo { void foo2(); } // Function declared inside struct
    struct foo3 {};
    void foo2(); // Function declared outside struct
    The first is only valid in C++.
    well that's my point, if that's only valid in C++ then compiling it in C++ would solve my problem away right?

  11. #26
    C++まいる!Cをこわせ! Elysia's Avatar
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    Indeed it would. I was only pointing out what master5001 was implying.
    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.

  12. #27
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    well now can someone please help me on how to compile this in C++?? as I tried what I did by replacing gcc with g++ and got errors

  13. #28
    a_capitalist_story
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    Haven't you been here long enough to realize "got errors" is insufficient???

  14. #29
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    here you go, :

    Code:
    util.cpp:133: error: &#226;T_STMT_FOR&#226; was not declared in this scope
    util.cpp:135: error: invalid use of incomplete type &#226;struct ExprNode&#226;
    util.cpp:11: error: forward declaration of &#226;struct ExprNode&#226;
    util.cpp:136: error: invalid use of incomplete type &#226;struct ExprNode&#226;
    util.cpp:11: error: forward declaration of &#226;struct ExprNode&#226;
    util.cpp:137: error: invalid use of incomplete type &#226;struct ExprNode&#226;
    util.cpp:11: error: forward declaration of &#226;struct ExprNode&#226;
    util.cpp:138: error: invalid use of incomplete type &#226;struct ExprNode&#226;
    util.cpp:11: error: forward declaration of &#226;struct ExprNode&#226;
    util.cpp:139: error: invalid use of incomplete type &#226;struct ExprNode&#226;
    util.cpp:11: error: forward declaration of &#226;struct ExprNode&#226;
    util.cpp:139: error: &#226;NULL&#226; was not declared in this scope
    util.cpp:139: error: invalid use of incomplete type &#226;struct ExprNode&#226;
    util.cpp:11: error: forward declaration of &#226;struct ExprNode&#226;
    util.cpp:141: error: &#226;T_STMT_RETURN&#226; was not declared in this scope
    util.cpp:143: error: invalid use of incomplete type &#226;struct ExprNode&#226;
    util.cpp:11: error: forward declaration of &#226;struct ExprNode&#226;
    util.cpp:144: error: invalid use of incomplete type &#226;struct ExprNode&#226;
    util.cpp:11: error: forward declaration of &#226;struct ExprNode&#226;
    util.cpp:144: error: &#226;NULL&#226; was not declared in this scope
    util.cpp:144: error: invalid use of incomplete type &#226;struct ExprNode&#226;
    util.cpp:11: error: forward declaration of &#226;struct ExprNode&#226;
    util.cpp:146: error: &#226;T_STMT_FUNCALL&#226; was not declared in this scope
    util.cpp:147: error: invalid use of incomplete type &#226;struct ExprNode&#226;
    util.cpp:11: error: forward declaration of &#226;struct ExprNode&#226;
    util.cpp:148: error: invalid use of incomplete type &#226;struct ExprNode&#226;
    util.cpp:11: error: forward declaration of &#226;struct ExprNode&#226;
    util.cpp:149: error: invalid use of incomplete type &#226;struct ExprNode&#226;
    util.cpp:11: error: forward declaration of &#226;struct ExprNode&#226;
    util.cpp:149: error: &#226;NULL&#226; was not declared in this scope
    util.cpp:149: error: invalid use of incomplete type &#226;struct ExprNode&#226;
    util.cpp:11: error: forward declaration of &#226;struct ExprNode&#226;
    util.cpp:151: error: &#226;T_STMT_ASSIGN_VAR&#226; was not declared in this scope
    util.cpp:152: error: invalid use of incomplete type &#226;struct ExprNode&#226;
    util.cpp:11: error: forward declaration of &#226;struct ExprNode&#226;
    util.cpp:153: error: invalid use of incomplete type &#226;struct ExprNode&#226;
    util.cpp:11: error: forward declaration of &#226;struct ExprNode&#226;
    util.cpp:154: error: invalid use of incomplete type &#226;struct ExprNode&#226;
    util.cpp:11: error: forward declaration of &#226;struct ExprNode&#226;
    util.cpp:154: error: &#226;NULL&#226; was not declared in this scope
    util.cpp:154: error: invalid use of incomplete type &#226;struct ExprNode&#226;
    util.cpp:11: error: forward declaration of &#226;struct ExprNode&#226;
    util.cpp:156: error: &#226;T_STMT_ASSIGN_ARRAY&#226; was not declared in this scope
    util.cpp:157: error: invalid use of incomplete type &#226;struct ExprNode&#226;
    util.cpp:11: error: forward declaration of &#226;struct ExprNode&#226;
    util.cpp:158: error: invalid use of incomplete type &#226;struct ExprNode&#226;
    util.cpp:11: error: forward declaration of &#226;struct ExprNode&#226;
    util.cpp:159: error: invalid use of incomplete type &#226;struct ExprNode&#226;
    util.cpp:11: error: forward declaration of &#226;struct ExprNode&#226;
    util.cpp:160: error: invalid use of incomplete type &#226;struct ExprNode&#226;
    util.cpp:11: error: forward declaration of &#226;struct ExprNode&#226;
    util.cpp:160: error: &#226;NULL&#226; was not declared in this scope
    util.cpp:160: error: invalid use of incomplete type &#226;struct ExprNode&#226;
    util.cpp:11: error: forward declaration of &#226;struct ExprNode&#226;
    util.cpp:163: error: &#226;T_DCL_VAR_INT&#226; was not declared in this scope
    util.cpp:164: error: invalid use of incomplete type &#226;struct ExprNode&#226;
    util.cpp:11: error: forward declaration of &#226;struct ExprNode&#226;
    util.cpp:165: error: invalid use of incomplete type &#226;struct ExprNode&#226;
    util.cpp:11: error: forward declaration of &#226;struct ExprNode&#226;
    util.cpp:165: error: &#226;NULL&#226; was not declared in this scope
    util.cpp:165: error: invalid use of incomplete type &#226;struct ExprNode&#226;
    util.cpp:11: error: forward declaration of &#226;struct ExprNode&#226;
    util.cpp:167: error: &#226;T_DCL_VAR_CHAR&#226; was not declared in this scope
    util.cpp:168: error: invalid use of incomplete type &#226;struct ExprNode&#226;
    util.cpp:11: error: forward declaration of &#226;struct ExprNode&#226;
    util.cpp:169: error: invalid use of incomplete type &#226;struct ExprNode&#226;
    util.cpp:11: error: forward declaration of &#226;struct ExprNode&#226;
    util.cpp:169: error: &#226;NULL&#226; was not declared in this scope
    util.cpp:169: error: invalid use of incomplete type &#226;struct ExprNode&#226;
    util.cpp:11: error: forward declaration of &#226;struct ExprNode&#226;
    util.cpp:171: error: &#226;T_DCL_ARRAY_INT&#226; was not declared in this scope
    util.cpp:172: error: invalid use of incomplete type &#226;struct ExprNode&#226;
    util.cpp:11: error: forward declaration of &#226;struct ExprNode&#226;
    util.cpp:172: error: invalid use of incomplete type &#226;struct ExprNode&#226;
    util.cpp:11: error: forward declaration of &#226;struct ExprNode&#226;
    util.cpp:173: error: invalid use of incomplete type &#226;struct ExprNode&#226;
    util.cpp:11: error: forward declaration of &#226;struct ExprNode&#226;
    util.cpp:173: error: &#226;NULL&#226; was not declared in this scope
    util.cpp:173: error: invalid use of incomplete type &#226;struct ExprNode&#226;
    I compiled using

    g++ -c -o util.o util.cpp

  15. #30
    C++まいる!Cをこわせ! Elysia's Avatar
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    The problem seems to be that you are using ExprNode before it has been defined.
    Did you put a forward declaration somewhere?
    Perhaps you should post the code in the source file up to the first usage of the struct?
    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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