foo.cc: In function 'int main()':
foo.cc:31:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   31 |  scanf("%d%d%d",&year1,&month1,&day1);
      |  ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
foo.cc:32:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   32 |  scanf("%d%d%d",&year2,&month2,&day2);
      |  ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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