foo.cc: In function 'int main()':
foo.cc:8:15: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
    8 |  if (year%4==0&&year%100!=0||year%400==0)//判断2月
      |      ~~~~~~~~~^~~~~~~~~~~~~
foo.cc:6:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
    6 |  scanf("%d %d %d",&year,&month,&day);//输入年月日
      |  ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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