57. State Machine Using Function Pointers

#include <stdio.h>

void state_init()    { printf("Init"); }
void state_load()    { printf("Load"); }
void state_execute() { printf("Execute"); }
void state_exit()    { printf("Exit"); }

typedef void (*fctptr_t)(void);
#define STATE_SIZE 4
#define STATE_SEQ_SIZE 3
fctptr_t states[STATE_SIZE]= {&state_init, &state_load, &state_execute, &state_exit};

void run_state_sequence(int start) {
    // Implement using function pointer array
    int index;
    for(int i =0;i<STATE_SEQ_SIZE;i++)
    {
        index = (start+i)%STATE_SIZE;
        states[index]();
        printf("\n");
    }
}

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