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IIf function often used in MultiDimensionalExpression (MDX), It’s quiet simple to implement single block of IIf block.
This an example of Multiple IIf logic block.
Example1:

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IIf(Measures.[Store Sales] > 50000, "Good",
IIf(Measures.[Store Sales] > 30000, "Average",
IIf(Measures.[Store Sales] > 10000, "Poor",
"No")))

A logical script in MDX to perform an “If..Then.. Else..” block.

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IIf(«Logical Expression», «Numeric/String Expression1», «Numeric/String Expression2»)

Example1:The following example returns 0 if Measures.CurrentMember is an empty cell, 1 otherwise:

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IIf(IsEmpty(Measures.CurrentMember), 0, 1)

Example2:The following string returns the string “Yes” if Measures.CurrentMember is an empty cell, the string, “No” otherwise:

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IIf(IsEmpty(Measures.CurrentMember), "Yes", "No")

Example3:

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IIf(
[Scenario].CurrentMember IS [Scenario].[Budget],
[Measures].[Budget [...]

There’s a few scenario to calculate a percentage of a measure in OLAP CUBE (Analysis Service 2000). A Percentage is common calculation in MDX , and it can be solved by divide a measure to  total value (Grand Total).
Sample 1:Measures.[Value Contribution to Total]:

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(Measures.[Value] / (Measures.[Value], Time.[ALL Time], Products.[ALL Products],…)

Sample 2:Measures.[Value Contribution to Total]:

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(Measures.[Value] / (Measures.[Value], [...]