As a user I can calculate factorials (x!) for whole numbers.
UAT
- [] 3
<enter><fac>-> [6] - [2]
<fac>-> [2] - [8]
<fac>-> [40320]
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RPN_Calculator_Factorials
As a user I can calculate factorials (x!) for whole numbers.
<enter> <fac> -> [6]<fac> -> [2]<fac> -> [40320]
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