Programming in Objective-C, Sixth Edition

Initializing Structures

Initializing structures is similar to initializing arrays; the elements are simply listed inside a pair of braces, with a comma separating each element.

To initialize the date structure variable today to July 2, 2014, you can use this statement:

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struct date today = {  7, 2, 2014 } ;

As with the initialization of an array, fewer values can be listed than the structure contains. So the statement

struct date today = {  7 } ;

sets today.month to 7 but gives no initial value to today.day or today.year. In such a case, their default initial values are undefined.

Specific members can be designated for initialization in any order with the notation

.member = value

in the initialization list, as in ...