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Accessing Structure Members

To access any member of a structure, we use the member access operator (.).
The member access operator is coded as a period between the structure variable
name and the structure member that we wish to access. You would use the keyword
struct to define variables of structure type. The following example shows how to 
use a structure in a program

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-> is a shorthand for (*x).field, where x is a pointer to a variable of type
struct account, and field is a field in the struct, such as account_number.

If you have a pointer to a struct, then saying

accountp->account_number;
is much more concise than

(*accountp).account_number;