peek(a, b)
 int *a, *b;
 { int *i;
   if(a<b)
      printf("\nArea grows from lo to hi addresses\n");
   else
    { printf("\nArea grows from hi to lo addresses\n");
      i = a; a = b; b = i;
    }
    printf("lo=%d hi=%d\n", a, b);
    for (i=a-10; i<=b+10; i++)
       printf("%11d %11o : %11d %11o\n", i, i, *i, *i);
 };