/in/foo.c: In function 'main':
/in/foo.c:7:7: warning: statement with no effect [-Wunused-value]
  for(i==1;i<=n;)
      ~^~~
/in/foo.c:11:4: warning: 'i' may be used uninitialized in this function [-Wmaybe-uninitialized]
   i++;
   ~^~