foo.c: In function 'main':
foo.c:5:9: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'printf'
    5 |         printf("请输入年份:");
      |         ^~~~~~
foo.c:8:22: error: 'month' undeclared (first use in this function)
    8 |         scanf("%d", &month);
      |                      ^~~~~
foo.c:8:22: note: each undeclared identifier is reported only once for each function it appears in

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