/in/foo.cc: In function 'int main()':
/in/foo.cc:8:13: warning: statement has no effect [-Wunused-value]
    8 |         for(n;j>0;n++)
      |             ^
/in/foo.cc:19:13: warning: statement has no effect [-Wunused-value]
   19 |         for(i;i<n;i++)
      |             ^