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Why, you might ask, do structure definitions end with a semicolon? After all, the final brace makes it clear where the structure definition ends:
*---- Semicolon
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struct trade {double price; int number;};
One reason is that the semicolon syntax allows you to describe a structure
and to define global variables using that structure in a single statement.
In the following single statement, for example, the trade structure
is defined and global variables t1 and t2 are defined to
belong to the trade structure.
struct trade {double price; int number;} t1, t2;
Thus, the semicolon tells C where the list of defined variables ends.