Passing enum pointer in parameters in C programming

Question

I have some problems passing my enum pointer to a function parameters.

#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>

//Prototypes
void automate(int tddv_estime, int tab_para_automate[][3], enum* Etat);
void fct_test(int scenario[]);


/*-----------------------------------------------------------------------
main()
-------------------------------------------------------------------------*/
int main()
{ 
int scenario[15] = {21, 21, 20, 12, 12, 20, 22, 22, 22, 22, 22, 22, 22, 22, 500};

fct_test(scenario);
return 0;
}

/*-----------------------------------------------------------------------
Fonction fct_test
-------------------------------------------------------------------------*/
void fct_test(int scenario[])
{
    //PARAMETRES
    int increment = 1;
    int tddv_estime;


int para_1_min = 5;
int para_1_max = 10;

int para_2_min = 1;
int para_2_max = 4;

int tab_para_automate[2][3] = {{0}};
int tab_para_application[2][2] = {{0}};

int i,j,k;

enum Etat {INIT, DECREMENT_PARA_1, INCREMENT_PARA_1, ETAT_INVARIANT_1, DECREMENT_PARA_2, ETAT_INVARIANT_2, INCREMENT_PARA_2, RADAR_SATURE};

/*printf("ETAT INITIAL\n");
printf("Para_1_courant = %d\n" , para_1_courant);
printf("Para_2_courant = %d\n\n\n" , para_2_courant);*/

for (k=0 ; k<16 ;k++)
{
    tab_para_automate[k][0] = para_1_min;
    tab_para_automate[k][1] = para_1_max;
}


for (j=1 ; j<16 ;j++)
{
    tab_para_automate[j][0] = para_2_min;
    tab_para_automate[j][1] = para_2_max;
}


    do {
    for (i=0 ; i<16 ; i++)
   {
        tddv_estime = scenario[i];
        automate(tddv_estime, tab_para_automate, &Etat);
   }
        }while (scenario[i] != 500);
}

/*-----------------------------------------------------------------------
Fonction automate
-------------------------------------------------------------------------*/

void automate(int tddv_estime, int tab_para_automate[][3], enum* Etat)
{
int evenement;

int tddv_worst = 20;
int para_1_min = tab_para_automate[0][0];
int para_1_max = tab_para_automate[0][1];

int para_2_min = tab_para_automate[1][0];
int para_2_max = tab_para_automate[1][1];

int para_2_courant = para_2_max;
int para_1_courant = para_2_max;

if (tddv_estime < tddv_worst)
    evenement = 1; //Etat initial

if (tddv_estime > tddv_worst)
    evenement = 2; //Decrement para1

if (tddv_estime < tddv_worst && tab_para_automate[0][0] < tab_para_automate[0][1])
    evenement = 3; //Increment para1

if (tddv_estime == tddv_worst)
    evenement = 4; //Etat Invariant 1

if (tddv_estime > tddv_worst && tab_para_automate[0][0] <= tab_para_automate[0][0])
    evenement = 5; //Decrement para_2

if (tddv_estime < tddv_worst && para_2_courant < tab_para_automate[1][1])
    evenement = 6; //Increment para2

if (tddv_estime == tddv_worst)
    evenement = 7; //Etat Invariant 2

if (tddv_estime > tddv_worst && tab_para_automate[0][0] <= para_1_min && para_2_courant <= para_2_min)
    evenement = 8; //Etat radar sature


}

I can't pass my enum pointer in parameters, i don't know why. I've been looking for the solution for a while now, can someone help me on this please ? Maybe the problem is in the prototypes, maybe i don't declare well my enum variable, i can't find the solution.

You already seem to understand the problem... Move the enum definition out of the function, before your prototypes. — Jonathon Reinhart
– Jonathon Reinhart, Commented Jul 4, 2018 at 13:39
In this line: automate(tddv_estime, tab_para_automate, &Etat); what is Etat? there is no such symbol in the scope of fct_test? — Jabberwocky
– Jabberwocky, Commented Jul 4, 2018 at 13:49
I moved the enum definition before the prototypes and i added : Etat etat = INIT; to instanciate the variables but i still have problems... — Mathieu TSH
– Mathieu TSH, Commented Jul 4, 2018 at 13:49

Ctx · Accepted Answer · 2018-07-04 13:49:12Z

1

You have to declare the type enum Etat before the first usage (i.e. directly after your includes):

#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>

enum Etat {INIT, DECREMENT_PARA_1, INCREMENT_PARA_1, ETAT_INVARIANT_1, DECREMENT_PARA_2, ETAT_INVARIANT_2, INCREMENT_PARA_2, RADAR_SATURE};

and fix the prototype and definition to use the new type (remember: the type is enum Etat)

//Prototypes
void automate(int tddv_estime, int tab_para_automate[][3], enum Etat *etat);
void fct_test(int scenario[]);

Then you have to instantiate an enum object before calling automate:

enum Etat etat;
automate(tddv_estime, tab_para_automate, &etat);

This is how you use enums correctly.

answered Jul 4, 2018 at 13:49

Ctx

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2 Comments

Mathieu TSH Over a year ago

Thanks, the problem was that i didn't instanciate an enum object before calling my function. I have another question, once an enum object is instanciated, can i use it in another function calling ?

Ctx Over a year ago

Yes, you can treat an enum object just like every other object (i.e. a struct), there is not much difference.

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