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 reverse(int *arr, int start, int end) {
    while (start < end) {
        // Swap elements at positions start and end
        int temp = arr[start];
        arr[start] = arr[end];
        arr[end] = temp;

        start++;
        end--;
    }
}

// Your logic here
void run_state_sequence(int start) {
    // Implement using function pointer array
    void (*state[4])(void) = {state_init,state_load,state_execute,state_exit};
    int arr[4] = {0,1,2,3};
    reverse(arr,0,start-1);
    reverse(arr,start,4-1);
    reverse(arr,0,4-1);

    for(int i = 0;i<3;i++)
        {
            // printf("%d",arr[i]);
            state[arr[i]]();
            if(i<2)
                printf("\n");
        }

}

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