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Task/Digital-root/FreeBASIC/digital-root.freebasic

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+' FB 1.05.0 Win64
+
+Function digitalRoot(n As UInteger, ByRef ap As Integer, base_ As Integer = 10) As Integer
+  Dim dr As Integer
+  ap = 0
+  Do
+    dr = 0
+    While n > 0
+      dr += n Mod base_
+      n = n \ base_
+    Wend
+    ap += 1
+    n = dr
+  Loop until dr < base_
+  Return dr
+End Function
+
+Dim As Integer dr, ap
+Dim a(3) As UInteger = {627615, 39390, 588225, 393900588225}
+For i As Integer = 0 To 3
+ ap = 0
+ dr = digitalRoot(a(i), ap)
+ Print a(i), "Additive Persistence ="; ap, "Digital root ="; dr
+ Print
+Next
+Print "Press any key to quit"
+Sleep