/in/foo.c:11:8: error: expected declaration specifiers or '...' before string constant
   11 | printf("%d\n",sum);
      |        ^~~~~~
/in/foo.c:11:15: error: unknown type name 'sum'
   11 | printf("%d\n",sum);
      |               ^~~
/in/foo.c:12:1: error: expected identifier or '(' before 'return'
   12 | return 0
      | ^~~~~~