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Returns one of two possible function results, depending on the logical value of the evaluated expression.
IIf (Expression, ExpressionTrue, ExpressionFalse)
Expression: Any expression that you want to evaluate. If the expression evaluates to True, the function returns the result of ExpressionTrue, otherwise it returns the result of ExpressionFalse.
ExpressionTrue, ExpressionFalse: Any expression, one of which will be returned as the function result, depending on the logical evaluation.
IIf evaluates both ExpressionTrue and ExpressionFalse even if it returns only one of them. If one of the expressions results in error, the function returns the error. For example, do not use IIF to bypass a possible division by zero result.
REM Returns the maximum of 3 values Function Max (A As Double, B As Double, C, As Double) As Double Max = IIf( A >= B, A, B) Max = IIf( C >= Max, C, Max) End Function REM Bad usage of function IIf Function Inverse(A As Double) As Double Inverse = IIf( A = 0, 0, 1/A ) End Function