/in/foo.c: In function 'main':
/in/foo.c:7:8: warning: statement with no effect [-Wunused-value]
   for(i==1;i<=n;i++)
       ~^~~
/in/foo.c:7:18: warning: 'i' may be used uninitialized in this function [-Wmaybe-uninitialized]
   for(i==1;i<=n;i++)
                 ~^~