/in/foo.cc: In function 'int main()':
/in/foo.cc:10:3: warning: statement has no effect [-Wunused-value]
  l<10;
  ~^~~
/in/foo.cc:18:8: warning: statement has no effect [-Wunused-value]
    l%10==x;
    ~~~~^~~
/in/foo.cc:21:8: warning: statement has no effect [-Wunused-value]
    l%10==x;
    ~~~~^~~
/in/foo.cc:26:8: warning: 'ans' may be used uninitialized in this function [-Wmaybe-uninitialized]
  cout<<ans<<endl;
        ^~~