A C Program for Simple Encryption/Decryption on the Command Line

This video walks through some techniques needed for the CSC220 project, including reading from user input, using preprocessor directives & writing makefiles.

0:16 - Reading characters from stdin
1:03 - A simple Caesar cypher encryption function
1:25 - Compiling & running
2:52 - Compiling & using a simple Caesar cypher decryption function
5:08 - Using preprocessor directives to allow the same program to be compiled for either encryption & decryption
5:54 - Using conditional compilation to get encrypt & decrypt programs from the same source file
7:07 - Writing a makefile