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"); }

void (*farr[])(void) = {state_init, state_load, state_execute, state_exit};

void run_state_sequence(int start) {
    farr[start%4]();
    printf("\n");
    farr[(start+1)%4](); 
    printf("\n");
    farr[(start+2)%4](); 
}

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