Tirsvad-Udemy-100_days_of_code/008-caesar_cipher
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008-caesar_cipher/docs/index.md
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Tirsvad 9d8beb3aef Refactor to unified caesar() function with encode/decode support 
- 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
2026-10-04 13:23:47 +08:00

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Caesar Cipher – documentation

Each letter is moved shift places through the alphabet: new_position = (ALPHABET.index(letter) + shift) % 26. The modulo keeps positions in range for shifts past z. Decoding shifts by -shift; one shared caesar(text, shift, direction) function does both. Non-letters are left untouched and letter case is preserved.

API reference: run doxygen Doxyfile from the repository root and open docs/doxygen/html/index.html. The step-by-step plan is in plan.md.

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