foo.c:1:9: error: #include expects "FILENAME" or <FILENAME>
    1 | #include
      |         ^
foo.c:2:6: warning: return type of 'main' is not 'int' [-Wmain]
    2 | void main()
      |      ^~~~
foo.c: In function 'main':
foo.c:5:1: warning: implicit declaration of function 'printf' [-Wimplicit-function-declaration]
    5 | printf("请输入年份:");
      | ^~~~~~
foo.c:5:1: warning: incompatible implicit declaration of built-in function 'printf'
foo.c:1:1: note: include '<stdio.h>' or provide a declaration of 'printf'
  +++ |+#include <stdio.h>
    1 | #include
foo.c:6:1: warning: implicit declaration of function 'scanf' [-Wimplicit-function-declaration]
    6 | scanf("%d",&year);
      | ^~~~~
foo.c:6:1: warning: incompatible implicit declaration of built-in function 'scanf'
foo.c:6:1: note: include '<stdio.h>' or provide a declaration of 'scanf'

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