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The Famous Recursive Algorithm In Old-Fashioned BASIC
This program is written in BWBasic, the version provided with DOSEMU, the DOS emulator. In this version of BASIC, you use GOSUB to call a procedure, and there are no local variables. So I used arrays to allocate memory for stacks, from where the "local variables" are taken.
From this code you can learn how recursion and functions with dynamic local variables work.