Project 3.2 MUD Shop

Objective

Prerequisites

This project requires that the MUD program from project 5 is working and passing the tests related to movement and viewing the player's inventory.

1. Upgraded to C++, alter Makefile, and verify it compiles
• The Mud Shop functionality of this level will be written in C++
• Your program from level 5 has been converted to a C++ program (we just renamed all the .C files to .cpp)
• Use cdhw to change to your work area (if accessing via remote terminal).
• create a shop.h and shop.cpp
• In the Makefile
• Change all the .c extensions to .cpp
• Add shop.o to OBJS
• Change the main.bin target's compiler from CC to CXX, which will use the g++ compiler instead of gcc
• To the bottom of the dependencies list, add shop.o: shop.h
• Run make to verify the conversion was successful.
• If it did not compile because of an undefined reference to your functions, try executing make clean && make. This is because the project is converted from C to C++.
• If it did not compile because of a malloc statement causing an invalid conversion from void *, this is caused by a slight difference between C and C++. C++ is requiring that malloc specifically cast the result to match the pointer.
• To fix, use casting to change the return type to match the variable being allocated.

Example

      // Add a cast to the malloc changing 
      Room *rooms = malloc(sizeof(Room)*(roomMaxId+1));
      // to the following, which now has a (Room*) just after equals sign
      Room *rooms = (Room*) malloc(sizeof(Room)*(roomMaxId+1));
      

• It should now be compiling.
2. Create an enum in data.h
• Add the following enum to data.h

    typedef enum ItemType {
        ITEM_TYPE_NONE=-1,
        ITEM_TYPE_GENERAL,
        ITEM_TYPE_QUEST,
        ITEM_TYPE_POTION,
        ITEM_TYPE_WEAPON,
        ITEM_TYPE_ARMOR    
    } ItemType;
    

3. Upgrade Item struct in data.h
• The Item struct needs some new fields

  
        int value;      // the value of the item
        int damage;     // damage the item does when used as a weapon
        ItemType type;  // the type of item, general, quest, potion, weapon, armor 
        bool last;      // marks the last item in the items list
        

4. Update load_json_items in data.cpp to load the new fields
• value and damage will use extract_int
• type will need a new function that equates general, quest, potion, weapon, armor to their enum counterparts.
• last is used to identify the last record in the array, so it will be false for all records except the last with an id > -1
• One approach for setting last would be to track a lastValidItemId

  If you are not a student in the class, then don't use last here, use a hardcoded macro variable with the value 1600 called MAX_JSON

  • Each time the code finds an Id, then set the lastValidItemId
  • After the loop, set the last value for the item at the index of lastValidItemId to true
5. Update main() in main.cpp to print out the new fields
• Update the printf for the items
• Add the new data for value, damage, type, last
• This should result in item 1697 looking like this:

  1697 Crimson Sword 104097 320 3 1

This challenge is locked

This challenge is locked

This challenge is locked

This challenge is locked

This challenge is locked

This challenge is locked