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Task/Anonymous-recursion/FreeBASIC/anonymous-recursion.freebasic

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+' FB 1.05.0 Win64
+
+#Lang "fblite"
+
+Option Gosub  '' enables Gosub to be used
+
+' Using gosub to simulate a nested function
+Function fib(n As UInteger) As UInteger
+  Gosub nestedFib
+  Exit Function
+
+  nestedFib:
+  fib = IIf(n < 2, n, fib(n - 1) + fib(n - 2))
+  Return
+End Function
+
+' This function simulates (rather messily) gosub by using 2 gotos and would therefore work
+' even in the default dialect
+Function fib2(n As UInteger) As UInteger
+  Goto nestedFib
+
+  exitFib:
+  Exit Function
+
+  nestedFib:
+  fib2 = IIf(n < 2, n, fib2(n - 1) + fib2(n - 2))
+  Goto exitFib
+End Function
+
+For i As Integer = 1 To 12
+  Print fib(i); " ";
+Next
+
+Print
+
+For j As Integer = 1 To 12
+  Print fib2(j); " ";
+Next
+
+Print
+Print "Press any key to quit"
+Sleep