Differentiated Learning for three levels of Skill
Engaged Learning
For each of the 40 challenge problems you are given a description of the program you are to create and example output. This allows users an opportunity to solve well defined problems that are meaningful and appropriate in scope. Here, all of the solution is user generated. It is engaged learning.
Meaningful Learning
For each of the 40 challenge problems you are given a comprehensive guide that will assist you in thought process needed to successfully code your program. This allows users appropriate assistance that tests their knowledge and forces them to generate the thoughts needed to solve the given problem. It is meaningful learning.
Purposeful Learning
For each of the 40 challenge problems you are given completed code, with comments, to highlight how to accomplish the end goal. This allows users to reference a working version of the program if they are stuck and cannot solve a portion of the problem without assistance. Rather than grow frustrated, the user can quickly reference this code to gain intellectual footing, and work back to solving the problem on their own. It is purposeful learning.