Tirsvad
9d8beb3aef
- Replace separate encrypt/decrypt with shared caesar() function - Add direction constants (DIRECTION_ENCODE, DIRECTION_DECODE) and prompts - Update main.py to support interactive encode/decode loop - Keep encrypt/decrypt as wrappers for backward compatibility - Add tests for caesar() with both directions and error handling - Update tests for main.py with interactive scenario tests
10 lines
513 B
Markdown
10 lines
513 B
Markdown
# Caesar Cipher – documentation
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Each letter is moved `shift` places through the alphabet:
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`new_position = (ALPHABET.index(letter) + shift) % 26`.
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The modulo keeps positions in range for shifts past `z`.
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Decoding shifts by `-shift`; one shared `caesar(text, shift, direction)` function does both. Non-letters are left untouched and letter case is preserved.
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API reference: run `doxygen Doxyfile` from the repository root and open
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`docs/doxygen/html/index.html`. The step-by-step plan is in [plan.md](plan.md).
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