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Task/Ackermann-function/FreeBASIC/ackermann-function.freebasic

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+' version 28-10-2016
+' compile with: fbc -s console
+' to do A(4, 2) the stack size needs to be increased
+' compile with: fbc -s console -t 2000
+
+Function ackerman (m As Long, n As Long) As Long
+
+    If m = 0 Then ackerman = n +1
+
+    If m > 0 Then
+        If n = 0 Then
+            ackerman = ackerman(m -1, 1)
+        Else
+            If n > 0 Then
+                ackerman = ackerman(m -1, ackerman(m, n -1))
+            End If
+        End If
+    End If
+End Function
+
+' ------=< MAIN >=------
+
+Dim As Long m, n
+Print
+
+For m = 0 To 4
+    Print Using "###"; m;
+    For n = 0 To 10
+        ' A(4, 1) or higher will run out of stack memory (default 1M)
+        ' change n = 1 to n = 2 to calculate A(4, 2), increase stack!
+        If m = 4 And n = 1 Then Exit For
+        Print Using "######"; ackerman(m, n);
+    Next
+    Print
+Next
+
+' empty keyboard buffer
+While InKey <> "" : Wend
+Print : Print "hit any key to end program"
+Sleep
+End