You will write functions for both addition and subtraction of two numbers encoded in your data structure. These functions should not be hard to write. Remember how you add and subtract numbers in base 10 and you should be able to figure out how to do it. Addition should automatically calculate the sum of memory locations 1 and 2 and store the answer in memory location 3 (erasing any other number that was previously in memory location 3). Subtraction should automatically calculate memory location 1 minus memory location 2 and store the answer in memory location 3 (again, erasing any previous data).