foo.cc: In function 'int main()':
foo.cc:6:11: 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); // 格式为:2019 05  10
      |      ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
foo.cc:23:8: warning: 'sum' may be used uninitialized in this function [-Wmaybe-uninitialized]
   23 |    sum = sum + day; // 再加上某天的天数
      |    ~~~~^~~~~~~~~~~

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