foo.cc: In function 'void out(int)':
foo.cc:26:36: warning: narrowing conversion of '((x % 10) + 48)' from 'int' to 'char' [-Wnarrowing]
   26 |         char sta[15] = { 1, x % 10 + '0' };
      |                             ~~~~~~~^~~~~
foo.cc:27:29: warning: array subscript has type 'char' [-Wchar-subscripts]
   27 |         while (x /= 10) sta[++sta[0]] = x % 10 + '0';
      |                             ^~~~~~~~
foo.cc:28:42: warning: array subscript has type 'char' [-Wchar-subscripts]
   28 |         while (sta[0]) putchar(sta[sta[0]--]);
      |                                    ~~~~~~^~
foo.cc: In function 'int main()':
foo.cc:37:13: warning: unused variable 'head' [-Wunused-variable]
   37 |         int head = 1;
      |             ^~~~

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