Challenge 146 - Shift Code

Summary

This is the first of the five chunky challenges that are created to allow the reader to practice all the skills they have learnt in a larger program that will take longer to complete. In this challenge the reader must create a program that will encode or decode a message using a shift code. The skills they will need include: input and display data, lists, splitting and joining strings, if statements, loops (while and for) and subprograms.