Chapter 16, Problem 4PC

Sequence Accumulation

Write n function

T accum(vector <T> v)

that forms and returns the “sum” of all items in the vector v passed to it. For example, if T is a numeric type such as int or double, the numeric sum will be returned, and if T represents the STL string type, then the result of concatenation is returned.

NOTE: For any type T, the expression T() yields the value or object created by the default constructor. For example, T() yields the empty string object if T is the string class. If T represents a numeric type such as 1nt, then T() yields 0. Use this fact to initialize your “accumulator.”

Test your function with a driver program that asks the user to enter three integers, uses accum to compute the sum, and prints out the sum. The program than asks the user to enter three strings, uses accum ro concatenate the strings, and prints the result.