/* What does this program print? */

#include <stdio.h>

void doit(int p[],int n)
{
  int t;
  while (--n > 0) {
    t = p[n-1];
    p[n-1] = p[n];
    p[n] = t;
    ++p;
    --n;
  }
}

int x[5] = {3,1,4,1,5};

main()
{
  int i;
  doit(x,5);
  for (i = 0;i < 5;++i)
    printf("%d\n",x[i]);
  doit(x,5);
  for (i = 0;i < 5;++i)
    printf("%d\n",x[i]);
}