/in/foo.cc: In function 'int main()':
/in/foo.cc:6:8: error: expected '(' before 'K'
  while K=k++n--n;
        ^
/in/foo.cc:6:10: error: 'k' was not declared in this scope
  while K=k++n--n;
          ^
/in/foo.cc:6:13: error: expected ')' before 'n'
  while K=k++n--n;
             ^
/in/foo.cc:6:16: error: expected ';' before 'n'
  while K=k++n--n;
                ^