foo.c: In function 'main':
foo.c:13:29: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
   13 |    if(year%400==0||year%4==0&&year%100!=0)
      |                    ~~~~~~~~~^~~~~~~~~~~~~
foo.c:7:2: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
    7 |  scanf("%d%d%d",&year,&month,&day);
      |  ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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