/in/foo.cc: In function 'bool isLeapyear(int)':
/in/foo.cc:7:17: warning: suggest parentheses around comparison in operand of '&' [-Wparentheses]
  if((n%4==0)&&(n&100!=0)||(n%400==0))return 1;
                 ^
/in/foo.cc:7:24: warning: 'and' of mutually exclusive equal-tests is always 0
  if((n%4==0)&&(n&100!=0)||(n%400==0))return 1;
                        ^
/in/foo.cc:7:25: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
  if((n%4==0)&&(n&100!=0)||(n%400==0))return 1;
                         ^
/in/foo.cc: In function 'int main()':
/in/foo.cc:18:24: warning: variable 'z' set but not used [-Wunused-but-set-variable]
   int y,m,d,day=0,plus,z=365;
                        ^
/in/foo.cc:29:7: warning: unused variable 'sum' [-Wunused-variable]
   int sum=0,cnt=0,i;
       ^
/in/foo.cc:29:13: warning: unused variable 'cnt' [-Wunused-variable]
   int sum=0,cnt=0,i;
             ^