how can i access a variable in enum - c

Question

#define NUMBER_OF_CARDS 54
typedef enum type{
QUEEN;
JACK;
KING
} CardTypes;
typedef struct game{
CardTypes cards[NUMBER_OF_CARDS];
struct{
int hearts;
int spades;
int clubs;
int diamonds;
}
int players_cards;
}GameState;
I have something similar like this and I want to access any variable from enum when this function is called
void set_cards(GameState gamestate, int x, int y, CardTypes cardtypes){
gamestate.cards[x * y] = cardtypes;
}
void generate_game(GameState gamestate){
/*
some code
*/
if(variable == 0){
set_cards(gamestate, x, y, gamestate.cards[NUMBER_OF_CARDS].JACK;
//This is what I have tried but it doesn't work
I hope you understand what I mean, because I really don't know how to explain this any better.
set_cards(gamestate, x, y, gamestate.cards[NUMBER_OF_CARDS].JACK;
//this is what I have tried but it doesn't work
please ignore any inaccuracies in the code. what is important for me is how can i access any of the enum's variable in the function generate_game().
this right here: if(variable == 0){ set_cards(gamestate, x, y, gamestate.cards[NUMBER_OF_CARDS].JACK; //This is what I have tried but it doesn't work

Answer 1

Based upon what #Aconcagua wrote your code should be using pointers :
// gamestate is a structure , so it must be passed as pointer to enable modification to be seen by caller
void set_cards(GameState *gamestate, int x, int y, CardTypes cardtypes){
gamestate->cards[x * y] = cardtypes;
}
void generate_game(GameState *gamestate){ // here also pointer so caller know the changes
/*
some code
*/
if(variable == 0){
// next depends on what you intend to do :
// 1- set the current games rate card with value of last card
set_cards(gamestate, x, y, gamestate->cards[NUMBER_OF_CARDS-1]);
// 2- set the current gamestate to JACK
set_cards(gamestate, x, y, JACK);

Answer 2

Your types do not have too much sense. Card is defined by its colour and type.
typedef enum {
QUEEN,
JACK,
KING,
//you neeed some more
} CardTypes;
typedef enum {
HEART,
SPADE,
CLUB,
DIAMOND,
} CardColour;
typedef struct
{
CardTypes type;
CardColur colour;
}Card;
Card deck[54];
How to access:
void foo(Card *card)
{
Card card1;
card1.colour = HEART;
card1.type = JACK;
card -> colour = DIAMOND;
card -> type = KING;
card[34].colour = CLUB;
card[34].type = QUEEN;
}