State Machine Using Function Pointers

Code

#include <stdio.h>

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

// Your logic here
void swap(void *arr[],int start,int end){
     while(start<end){
        void *temp=arr[start];
        arr[start]=arr[end];
        arr[end]=temp;
        start++;
        end--;
     }
}
void run_state_sequence(int start) {
    // Implement using function pointer array
    void (*arr[])(void)={state_init,state_load,state_execute,state_exit};
    int n=4;
    if (start > 0) {
        swap((void**)arr, 0, start - 1);
        swap((void**)arr, start, n - 1);
        swap((void**)arr, 0, n - 1);
    }

    for (int i = 0; i < 3; i++) {
        arr[i]();
        printf("\n");
    }
}

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

Solving Approach