Example programs by topic

Basics
• i/o with formatting (scanf, printf)
• making change for cash amounts (basic i/o, calculation)
   
  Using our own functions
• simple functions
• program to compute the cost of a car rental
• rotating parameter values (pass-by-reference)
• solving quadratic equations
   
  Functions and recursion
• function to get an integer, recursive error checking
• Towers of Hanoi
   
  Functions and loops
• loops and printf
   
  Arrays, functions, and loops
• filling, summing, comparing arrays
• generate a list of primes
• Seeing if one string is an anagram of another
   
  Arrays, functions, and recursion
• generate all the anagrams of a string
   
  Random number generators
• Ask the octal magic ball a question
• Shuffling and displaying a deck of cards
• Computer vs player guessing game (command line arguments)
   
  Using two-dimensional arrays
• Cannon simulation (pick an angle/velocity, try to hit the target)
• Langton's ant: simulation (uses some ascii terminal control)
   
  Using file i/o and structs
• Program to remove comments from another C++ program
   
  Using two-dimensional arrays and structs
• Working with a 2D matrix (2d arrays)

Aside: if you're interested in seeing the source code for linux programs such as cp, ls, mv, rm, etc. see: git.savannah.gnu.org/cgit/coreutils.git/tree/src

Similarly, if you're interested in seeing the source code for bash commands such as alias, cd, source, etc. see: git.savannah.gnu.org/cgit/bash.git/tree/builtins