/in/foo.cc: In function 'int main()':
/in/foo.cc:6:8: warning: comparison of constant '1000000000' with boolean expression is always true [-Wbool-compare]
  1 < x < 1000000000;
  ~~~~~~^~~~~~~~~~~~
/in/foo.cc:6:4: warning: comparisons like 'X<=Y<=Z' do not have their mathematical meaning [-Wparentheses]
  1 < x < 1000000000;
  ~~^~~
/in/foo.cc:6:8: warning: statement has no effect [-Wunused-value]
  1 < x < 1000000000;
  ~~~~~~^~~~~~~~~~~~