I'm interested in seeing a driver program have a function which forms and returns the "sum" of all items in the vector v passed to it and if T

I'm interested in seeing a driver program have a function which forms and returns the "sum" of all items in the vector v passed to it and if T represents the STL string type, then the result of concatenation is returned. Which also ask the user to enter three integers, uses accum to compute the sum, and prints out the sum. It then asks the user to enter three strings, uses accum to concatenate the strings, and prints the result.