MP3: TopSecret

The Assignment

As always, start this MP by reading R-E-A-D-M-E-F-I-R-S-T.txt, in the MP you checked-out from subversion.

This graded assignment consists of four short programs:

• CaesarCipher
• CipherBreaker
• OddSum
• MagicEightBall

As Julius Caesar's lead programmer for the Roman Empire (RE), you need to write a program from scratch to help Julius encrypt and decrypt his military orders. This task is described in CaesarCipher.txt.

What You Will Learn

1. Programming Skills:
   • Reverse engineering (reading Java unit test code and figuring out the specification & implementation)
2. Java Skills:
   • Perform simple calculations using arithmetic operators.
   • Use string instance methods length, charAt, concatenation.
   • Use integer arithmetic (characters as integers, modulus).

What You Should Already Know

• ch1.4 Fundamental Building Blocks of Programs
• ch2.1 The Basic Java Application
• ch2.2 Variables and the Primitive Types
• ch2.3 Strings Objects, Enums, and Subroutines
• ch2.4 Text Input and Output
• ch3.1 Loops and Branches
• ch3.3 while and do-while
• ch3.4 for statement
• ch3.5 If Statement