How can I fix this error: unrecognized rule

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Im writing a simple progamm using the lists in flex but it shows an error in line 22 and i cant understand it.Can you pls help me ?

Here the code

C++

%{
	#include<stdio.h>
%}
%%
typedef struct liste{
	char * cle;
	int    data;
	struct liste * svt;
} noeud, *liste;
liste inserer( char * k )
{
	liste aux;
	aux = ts;
	while ( aux ){
		if ( strcmp( aux->cle, k ) == 0 )
		return aux;
		aux = aux -> svt;
	}
	printf("\nInsertion...");
	aux = ( liste ) malloc( sizeof(noeud) );
	aux->cle = (char *) malloc( strlen(k) + 1 );
	strcpy( aux->cle, k ); //LIGNE 22
	aux->data = 0;
	aux->svt  = ts;
	ts = aux;
	return ts;
}

What I have tried:

I tried deleting the spaces and that is all

Posted 28-Mar-16 12:56pm

Member 12421850

Updated 28-Mar-16 21:31pm

Patrice T

v3

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2 solutions

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Patrice T · Answer 1 · 2016-03-28T20:05:00

The first problem is that your code is at a place it should not be, because of misplaced %.
You are very confused about the difference between a pointer and the data pointed by a pointer.
I see at least 6 errors in the code.
[French]
D'après ce que je vois, tu brule les étapes, et c'est pas bon.
Conseil:
- laisse de coté flex pour l'instant.
- apprend correctement le langage C en lisant la documentation et en suivant les exemples et les tutoriels (il vaut mieux trop que pas assez).
- quand tu maitrisera, tu pourra revenir à flex.

pour flex:
- prend aussi le temps d'apprendre, commence avec des sujets que tu maitrise.
- pour ton projet, essaye de débugger ton code avant de l'intégrer dans ton projet Flex.

Jochen Arndt · Answer 2 · 2016-03-28T21:31:00

Solution 2

You are using the same name for the type and one object (liste) but the object is a pointer while the type is not. So you should use a different name for the pointer and use that for your variable:

C++

typedef struct liste{
	char * cle;
	int    data;
	struct liste * svt;
} noeud, *pliste;

pliste inserer( char * k )
{
    pliste aux;
    /* ... */
    aux = ( pliste ) malloc( sizeof(noeud) );

[EDIT]
The file format is not a valid flex file because the separator between rules and user code is missing. If there are no rules just insert the line:

C++

%{
	#include<stdio.h>
	#include<string.h>
%}
%%
/* Rules */
%%
/* User code*/
typedef struct liste{
/* ... */

[/EDIT]
[EDIT2]
Added inclusion of string.h above to make the compiler happy.
[/EDIT]

Posted 28-Mar-16 21:31pm

Jochen Arndt

Updated 28-Mar-16 23:05pm

v3

Comments

Member 12421850 29-Mar-16 4:11am

I fixed that i mean i replaced 'liste' by 'pliste' but it kept showing the same error.

Jochen Arndt 29-Mar-16 4:20am

Which error (please show the complete message)?

If it is something regarding the strcpy() function, include the string.h header file.

Member 12421850 29-Mar-16 4:24am

I wish i can take a capture but i cant though but when i want to excute the file it sends this error:--->Line 22: unrecognized rule <---- that is the ONLY whole message
And yes it is about the strcpy() i guess..

Jochen Arndt 29-Mar-16 4:41am

It is a flex error. I just tested it and there is a "%%" separator line missing. I will update my answer.

Member 12421850 29-Mar-16 4:47am

I will be waiting, thank you!

Jochen Arndt 29-Mar-16 4:54am

Update is there.
The error tells it: "Unrecognized rule".
Flex does not recognize the rule. But the error occurs inside some C code. The general flex input format is:

definitions
%%
rules
%%
user code

So ensure that your code is in the code section by inserting another "%%" line.

Member 12421850 29-Mar-16 4:59am

yes i noticed thank you alot! but now it shows another error about strcpy and strlen, it says "incompatible implicit declaration of built-in function...[enable by default]

Jochen Arndt 29-Mar-16 5:04am

That is an error issued by the C compiler.

I already gave you the solution:
Add another include statement for string.h.

Member 12421850 29-Mar-16 5:06am

Ah right omg i forgot that one really.Thank you for the help!

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