/in/foo.cc: In function 'int isleap(int)':
/in/foo.cc:5:31: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
    5 |         if(y%400==0 || y%4==0 && y%100!=0)
      |                        ~~~~~~~^~~~~~~~~~~
/in/foo.cc: In function 'int monthday(int, int)':
/in/foo.cc:18:1: warning: control reaches end of non-void function [-Wreturn-type]
   18 | }
      | ^