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) {
    void (*fp[4])(void) = {state_init,state_load,state_execute,state_exit};
    for(int i = 0;i<3;i++)
    {
        int inx = (start + i)%4;
        fp[inx]();
    }
}

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