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Why are these two headers the same? But I can get rid of a program and it still works. What does this circle mean

yy81103892 注册会员
2023-02-27 09:04

defines a student structure that includes fields such as id.

dskfepay 注册会员
2023-02-27 09:04

1.
2. Define a structure type with three members in curly brackets, alias the type STUDENT, and use STUDENT a to define it later. To define a structure variable a