#include<stdio.h>
int a_int_rev2(int *q, int n)
{
  int k, kari_atai;
  
  for (k = 0; k <= (n-1)/2; k++) {
    kari_atai = q[k];
    q[k] = q[n-k-1];
    q[n-k-1] = kari_atai;
  }   
  return kari_atai;
}

int main(void)
{
  int y[10] = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9};
  int w;

  w = a_int_rev2(y, 10);
  printf("%d\n",w);
    for(int i=0;i<10;i++){
        printf("%d",y[i]);
    }
    
  return 0;
}