The Conditional Operator
Perhaps the most unusual operator in the Objective-C language is one called the conditional operator. Unlike all other operators in Objective-C—which are either unary or binary operators—the conditional operator is a ternary operator; that is, it takes three operands. The two symbols used to denote this operator are the question mark (?) and the colon (:). The first operand is placed before the ?, the second between the ? and the :, and the third after the :.
The general format of the conditional expression is shown here:
condition ? expression1 : expression2
In this syntax, condition is an expression, usually a relational expression, that the Objective-C system evaluates first whenever ...
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