foo.c: In function 'main':
foo.c:5:3: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
    5 |   scanf("%d%d%d", &year,&yue,&day);
      |   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
foo.c:6:3: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
    6 |   scanf("%d", &num);
      |   ^~~~~~~~~~~~~~~~~

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