Serena

module Program open Calculator open Models [<EntryPoint>] let main argv = printfn "Hello, F# World!" // Test calculator functions let result1 = add 5 3 printfn "5 + 3 = %d" result1 let result2 = subtract 10 4 printfn "10 - 4 = %d" result2 let result3 = multiply 6 7 printfn "6 * 7 = %d" result3 let result4 = divide 15 3 printfn "15 / 3 = %.2f" result4 // Test calculator class let calc = CalculatorClass() let classResult = calc.Add(20, 5) printfn "Calculator class: 20 + 5 = %d" classResult // Test person module let person = PersonModule.createPerson "Alice Smith" 25 (Some "alice@example.com") printfn "Person: %s" (PersonModule.getDisplayName person) printfn "Is adult: %b" (PersonModule.isAdult person) // Test factorial let fact5 = factorial 5 printfn "5! = %d" fact5 0 // return success