/in/foo.cc: In function 'int days(d, d)':
/in/foo.cc:2:27: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
 #define leap(y) ((y)%4==0 && (y)%100!=0 || (y)%400==0)
                  ~~~~~~~~~^~~~~~~~~~~~~
/in/foo.cc:12:5: note: in expansion of macro 'leap'
 td+=leap(i)?366:365;
     ^~~~
/in/foo.cc:2:27: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
 #define leap(y) ((y)%4==0 && (y)%100!=0 || (y)%400==0)
                  ~~~~~~~~~^~~~~~~~~~~~~
/in/foo.cc:14:9: note: in expansion of macro 'leap'
 td-=mon[leap(d1.y)][i];
         ^~~~
/in/foo.cc:2:27: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
 #define leap(y) ((y)%4==0 && (y)%100!=0 || (y)%400==0)
                  ~~~~~~~~~^~~~~~~~~~~~~
/in/foo.cc:17:9: note: in expansion of macro 'leap'
 td+=mon[leap(d2.y)][i];
         ^~~~