/in/foo.cc: In function 'int main()':
/in/foo.cc:9:7: warning: statement has no effect [-Wunused-value]
  for(i;i<=n;i++)
       ^
/in/foo.cc:16:7: warning: statement has no effect [-Wunused-value]
  for(i;i<=n;i++)
       ^
/in/foo.cc:45:7: warning: statement has no effect [-Wunused-value]
  for(i;i<=n;i++)
       ^