c++ for_each() and object functions

Question

I have an assignment that is the following:

For a given integer array, find the sum of its elements and print out the final result, but to get the sum, you need to e

Answer 1

You're not constructing the vector right. The constructor that takes two integers is

vector(size_type _Count, const Type& _Val);

So _Count is 1 and _Value is an undefined value past the end of the array.