foo.cc: In function 'int main()':
foo.cc:39:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   39 |  scanf("%d%d%d",&year1,&month1,&day1);
      |  ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
foo.cc:40:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   40 |   scanf("%d%d%d",&year2,&month2,&day2);
      |   ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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