#include <stdio.h>
#include <stdlib.h>
     
int main() {
      int x[] = { 0, 1, 2, 3, 4 };
      int i, size = 5;
      int middle = size >> 1;
      int shift = size % 2;
      int middle_elem = x[middle];
      for(i = 0; i < middle; i++){
          int t = x[i];
          x[i] = x[i + middle + shift];
          x[i + middle] = t;
      }
      if(shift) x[size - 1] = middle_elem;
      return 0;
}