Data commit

Task/Caesar-cipher/PureBasic/caesar-cipher-2.basic

@@ -0,0 +1,21 @@
+Procedure.s CC_encrypt(text.s, key, reverse = 0)
+  ;if reverse <> 0 then reverse the encryption (decrypt)
+  Protected i, *letter.Character, *resultLetter.Character, result.s = Space(Len(text))
+
+  If reverse: key = 26 - key: EndIf
+  If key < 1 Or key > 25: ProcedureReturn: EndIf  ;exit if key out of range
+
+  *letter = @text: *resultLetter = @result
+  While *letter\c
+    Select *letter\c
+      Case 'A' To 'Z'
+        *resultLetter\c = ((*letter\c - 65 + key) % 26) + 65
+      Case 'a' To 'z'
+        *resultLetter\c = ((*letter\c - 97 + key) % 26) + 97
+      Default
+        *resultLetter\c = *letter\c
+    EndSelect
+    *letter + SizeOf(Character): *resultLetter + SizeOf(Character)
+  Wend
+  ProcedureReturn result
+EndProcedure