/in/foo.c: In function 'main':
/in/foo.c:15:20: warning: unknown conversion type character '\x0a' in format [-Wformat=]
   15 |         printf("%.2\n",sum);
      |                    ^~
/in/foo.c:15:16: warning: too many arguments for format [-Wformat-extra-args]
   15 |         printf("%.2\n",sum);
      |                ^~~~~~~