Answer 1

I don't know about C++ but in C# syntax, read it and write for your C++.

int sum = 0;
int[] array = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10};

foreach(int i in array)
{
sum += array[i];
}

or

for(int i = 0; i < array.Length(); i++)
{
sum += array[i];
}