/in/foo.cc: In function 'int days(d, d)':
/in/foo.cc:2:40: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
 #define leap(y) ((y)%400==0||(y)%100!=0&&(y)%4==0)
                              ~~~~~~~~~~^~~~~~~~~~
/in/foo.cc:13:5: note: in expansion of macro 'leap'
 td+=leap(i)?366:365;
     ^~~~
/in/foo.cc:2:40: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
 #define leap(y) ((y)%400==0||(y)%100!=0&&(y)%4==0)
                              ~~~~~~~~~~^~~~~~~~~~
/in/foo.cc:15:9: note: in expansion of macro 'leap'
 td-=mon[leap(d1.y)][i];
         ^~~~
/in/foo.cc:2:40: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
 #define leap(y) ((y)%400==0||(y)%100!=0&&(y)%4==0)
                              ~~~~~~~~~~^~~~~~~~~~
/in/foo.cc:18:9: note: in expansion of macro 'leap'
 td+=mon[leap(d2.y)][i];
         ^~~~