57. State Machine Using Function Pointers

#include <stdio.h>

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

void run_state_sequence(int start) {
     // Function pointer array
    void (*states[4])(void) = {
        state_init, state_load, state_execute, state_exit
    };

    // Loop through 3 states, wrapping around using modulo
    for (int i = 0; i < 3; i++) {
        int index = (start + i) % 4;
        states[index]();
    }
}

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