README.md

harvard-cs50

Problem sets and labs for Harvard CS50 offered through OpenCourseWare.
Course outline:
https://cs50.harvard.edu/x/2021/

week 1: C

(exercises completed in the CS50 IDE)
to test for bugs and style respectively:
library: #include <cs50.h>
terminal commands: check50 #cfile / style50 #cfile

lab:

• population growth simulation

$ ./population
Start size: 100
End size: 200
Years: 9

problem set:

• Mario ASCII art
• Credit card number validation
  • Luhn's algorithm

week 2: arrays

lab:

• Scrabble command line program:
  • prompts users for two words
  • iterates through letters
  • uses ASCII values to match A-Z[i] to a Scrabble letter score
  • totals letter scores for each word
  • prints winner
  • IMPROVEMENT: verify that user-entered words are real dictionary words.

problem set:

• Readability command line program
  • takes user input & verifies the reading grade level for texts
  • Coleman-Lindau index formula
• Substituition comman line program
  • prompts user for scrambled alphabet cipherkey (no repeat letters, 26char only letters)
    • example keys: vchprzgjntlskfbdqwaxeuymoi, VCHPRZGJNTLSKFBDQWAXEUYMOI, VcHpRzGjNtLsKfBdQwAxEuYmOi
  • changes user-input plaintext to ciphertext
    • retains user casing and symbol/space/number placement
      • e.g. hELL0, W0RLd! -> jRSS0, Y0WSp!
  • usage: ./substitution *key*
  • IMPROVEMENT: currently can only handle plaintext up to 24 characters long

credit

all code in labs and problem sets is originally written by me, going off of the course's distribution code.