/in/foo.c: In function 'main':
/in/foo.c:7:3: error: expected ';' before 'if'
   if(year%4==0)
   ^~
/in/foo.c:5:24: warning: unused variable 'leap' [-Wunused-variable]
     int year,month,day,leap;
                        ^~~~
/in/foo.c:5:20: warning: unused variable 'day' [-Wunused-variable]
     int year,month,day,leap;
                    ^~~