/in/foo.c: In function 'main':
/in/foo.c:13:2: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
  for(i=2;i<=(int)sqrt(a);i=i+1)
  ^~~
/in/foo.c:17:3: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'for'
   if(i<=(int)sqrt(a))
   ^~
/in/foo.c:19:11: warning: too many arguments for format [-Wformat-extra-args]
    printf("No\n",a);
           ^~~~~~
/in/foo.c:23:11: warning: too many arguments for format [-Wformat-extra-args]
    printf("Yes\n",a);
           ^~~~~~~