Data Structures For Stackable Attributes In An RPG

I'm wrangling with issues regarding how character equipment and attributes are stored within my game.My characters and equippable items have 22 different total attributes (HP, MP, ATP, DFP). A character has their base-statistics and can equip up to four items at one time.[code]Final character ATP in this case would be 88.I'm looking for a way to implement this in my code. Well, I already have this implemented but it isn't elegant. Right now, I have ClassA that stores these attributes in an array. Then, I have ClassB that takes five ClassA and will add up the values and return the final attribute.However, I need to emphasize that this isn't an elegant solution. There has to be some better way to access and manipulate these attributes, including data structures that I haven't thought of using.I should note that there are some restrictions on these attributes that I need to be put in place.E.g.,these are the baselines.For instance, the character's own HP and MP cannot be more than the baseline and cannot be less than 0, whereas the ATP and MST can be. I also currently cannot enforce these constraints without hacking what I currently have :(