sum array c 2b 2b

1//Syntax
2accumulate(first, last, sum);
3accumulate(first, last, sum, myfun); 
4
5first, last : first and last elements of range 
6              whose elements are to be added
7sum :  initial value of the sum
8myfun : a function for performing any 
9        specific task. For example, we can
10        find product of elements between
11        first and last.
12//Example
13  int a[] = {5 , 10 , 15} ;
14  int res = accumulate(a,a+3,0); // 30

1 array<int,10> a{1,2,3,4,5,6,7,8,9};
2  int sum = 0;
3//Method 1:
4  sum = accumulatea(a.begin(), a.end(), 0);
5//Method 2: 
6  for(auto& i : a) sum+=i;