/in/foo.cc:18:16: warning: missing terminating " character
         printf("o.O\");
                ^
/in/foo.cc:18:16: error: missing terminating " character
         printf("o.O\");
                ^~~~~~~~
/in/foo.cc: In function 'int main()':
/in/foo.cc:19:5: error: expected primary-expression before '}' token
     }
     ^
/in/foo.cc:8:9: warning: unused variable 'days_in_month' [-Wunused-variable]
     int days_in_month[] = {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
         ^~~~~~~~~~~~~