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Implement a Caesar cipher, both encoding and decoding. The key is an integer from 1 to 25. This cipher rotates the letters of the alphabet (A to Z). The encoding replaces each letter with the 1st to 25th next letter in the alphabet (wrapping Z to A). So key 2 encrypts “HI” to “JK”, but key 20 encrypts “HI” to “BC”.
CS50x Week 6 solutions with detailed explanations. Includes programs for calculating change (cash.py), validating credit cards (credit.py), DNA matching (DNA.py), and printing pyramids mario.py in both difficulties. Each program features in-depth descriptions and key insights.