https://bugs.kde.org/show_bug.cgi?id=501399

            Bug ID: 501399
           Summary: Calculate Pi function via factorial
    Classification: Applications
           Product: kcalc
           Version: 24.12.2
          Platform: Other
                OS: Linux
            Status: REPORTED
          Severity: wishlist
          Priority: NOR
         Component: general
          Assignee: evan.te...@gmail.com
          Reporter: alerikaisatt...@protonmail.com
                CC: gabriel.barrantes....@outlook.com
  Target Milestone: ---

SUMMARY
Currently, attempting to calculate factorial of a fractional number calculates
factorial of its integer part. It would be a lot better if it calculated Pi
function, the extension of factorial to fractional numbers

STEPS TO REPRODUCE
1. Input a fractional number into KCalc (ex: 0.5)
2. Calculate its factorial

OBSERVED RESULT
Factorial of integer part is calculated (in this case, 1)

EXPECTED RESULT
Pi function is calculated (in this case, number equal to sqrt(pi)/2)

SOFTWARE/OS VERSIONS
Linux/KDE Plasma:
KDE Plasma Version: 6.2.5
KDE Frameworks Version: 6.10.0
Qt Version: 6.8.2

ADDITIONAL INFORMATION
Even Windows calculator does this

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