Check out example codes for "accumulate() in c++". It will help you in understanding the concepts better.

Code Example 1

```
accumulate(first, last, sum);
first, last : first and last elements of range
whose elements are to be added
suppose array is 'a'.
sum : initial value of the sum
Eg: int sum=0;
accumulate(a.begin(),a.end(),sum);
```

Code Example 2

```
accumulate(first, last, sum);
first, last : first and last elements of range
whose elements are to be added
sum : initial value of the sum
```

Code Example 3

`accumulate(start, end, initial_sum);`

Code Example 4

```
accumulate(first, last, sum, myfun);
myfun : a function for performing any
specific task. For example, we can
find product of elements between
first and last.
```

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