/in/foo.cc: In function 'int main()':
/in/foo.cc:10:17: warning: spurious trailing '%' in format [-Wformat=]
   10 |   sprintf(s,"02d%",i);
      |                 ^
/in/foo.cc:10:13: warning: too many arguments for format [-Wformat-extra-args]
   10 |   sprintf(s,"02d%",i);
      |             ^~~~~~