. (direct Member Selector)
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postfix-expression . identifier
postfix-expression must be of type union or structure.
identifier must be the name of a member of that structure or union type.
Use the selection operator (.) to access structure and union members.
Suppose that the object
s is of struct type
sptr is a pointer to
S. Then, if
m is a member identifier of type
M declared in
S, this expression:
are of type
M, and represent the member object