%10-4  жĳһǷΪꡣ
%úжĳһǷΪ
%ʹøʽΪisleapea(y),yûҪ
function isleapyear(year)
sign=0;
if rem(year,4)==0
   sign=sign+1;
end
if rem(year,100)==0
       sign=sign-1;
 end
 if rem(year,400)==0
        sign=sign+1;
  end
  if sign==1
      fprintf('%4d year is a leap year.\n',year)
  else 
      fprintf('%4d year is not a leap year.\n',year)
  end
