5. Create an interface MessageDecoder that has a single abstract method decode(cipher Text), where cipher Text is the message to be decoded. The method will return the decoded message. Modify the classes 8.5 Graphics Supplement SubstitutionCipher and ShuffleCipher, as described in Exercises 16 and 17, so that they implement Message Decoder as well as the interface MessageEncoder that Exercise 15 describes. Finally, write a program that allows a user to encode and decode messages entered on the keyboard. 703

The question is p8. 2

For the Assignment 5 (Part 2), Routes v.2 at the end of this module you will create a Route class that has a member a "bag" of Leg objects. The bag is to use a vector of pointers, but since all the objects in the bag are to be Leg s, it's okay to use Leg* instead of void* in the bag's declaration. You wrote its first constructor in a previous exercise. Now write a second one. (You may refer to the Assignment page to refer to the completed class declarations of Leg and Route classes). Assume that class Leg has data member C strings const char* const beginCity; and const char* const endCity; that are available to Route by a friend relationship. Write a constructor function for a Route class that takes exactly two parameters: a constant Route object reference to an already-existing Route , and a constant Leg object reference to be appended to the end of that Route to form the new Route . Here's the algorithm: Copy the first parameter's bag into the host object's bag. If the endCity of…

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