State Machine Using Function Pointers

Code

#include <stdio.h>

typedef enum STATE_ID {
    INIT,
    LOAD,
    EXECUTE,
    EXIT,
    NUM_STATES
} State_ID_t;

State_ID_t state_init()    { printf("Init"); return LOAD;}
State_ID_t state_load()    { printf("Load"); return EXECUTE;}
State_ID_t state_execute() { printf("Execute"); return EXIT;}
State_ID_t state_exit()    { printf("Exit"); return INIT;}

typedef struct {
    State_ID_t state_id;
    State_ID_t (*state_action) (void);
} State_t;

static const State_t states[NUM_STATES] = {
    {INIT,    state_init},
    {LOAD,    state_load},
    {EXECUTE, state_execute},
    {EXIT,    state_exit}
};

// Your logic here
void run_state_sequence(int start) {
    
    State_ID_t current_state = (State_ID_t) start;
    // Implement using function pointer array
    for (int i =0; i <3; i++) {
        current_state = states[current_state].state_action();
        printf("\n");
    }
}

int main() {
    int start;
    scanf("%d", &start);
    run_state_sequence(start);
    return 0;
}

Solving Approach