x = 100;

while ( x >= 0 )

  y = 1;
  while (y <= x) 
    if (y == x/2)
      print "the middle iteration";
    else
      if (y == 1)
         printf "we are inside the while loop";
      endif
    endif

    y = y+1;
  endwile
 
  x = x - 1;

endwhile

print "end of execution";