IIF - Syntax

Syntax

The syntax of the IIf function is as follows:

All three parameters are required:

• expr is the expression that is to be evaluated.
• truepart defines what the IIf function returns if the evaluation of expr returns true.
• falsepart defines what the IIf function returns if the evaluation of expr returns false.

Many languages have an operator to accomplish the same purpose, generally referred to as a conditional operator (or, less accurately, as a ternary operator); the best known is ?:, as used in C, C++, and related languages. Some of the problems with the IIf function, as discussed later, do not exist with a conditional operator, because the language is free to examine the type and delay evaluation of the operands, as opposed to simply passing them to a library function.