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Task/Rot-13/FreeBASIC/rot-13.freebasic

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+' FB 1.05.0 Win64
+
+' uses in place encoding/decoding
+Sub rot13(ByRef s As String)
+  If s = "" Then Exit Sub
+  Dim code As Integer
+  For i As Integer = 0 To Len(s) - 1
+    Select Case As Const s[i]
+      Case 65 To 90  '' A to Z
+        code = s[i] + 13
+        If code > 90 Then code -= 26
+        s[i] = code
+      Case 97 To 122 '' a to z
+        code = s[i] + 13
+        If code > 122 Then code -= 26
+        s[i] = code
+     End Select
+  Next
+End Sub
+
+Dim s As String = "nowhere ABJURER"
+Print "Before encoding : "; s
+rot13(s)
+Print "After encoding  : "; s
+rot13(s)
+Print "After decoding  : "; s
+Print
+Print "Press any key to quit"
+Sleep