# How to find the sum of elements of an Array using STL in C++?

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Here we will see how to find the sum of all element of an array. So if the array is like [12, 45, 74, 32, 66, 96, 21, 32, 27], then sum will be: 405. So here we have to use the accumulate() function to solve this problem. This function description is present inside <numeric> header file.

## Example

Live Demo

#include<iostream>
#include<numeric>
using namespace std;
int main() {
int arr[] = {12, 45, 74, 32, 66, 96, 21, 32, 27};
int n = sizeof(arr) / sizeof(arr);
cout << "Array is like: ";
for (int i = 0; i < n; i++)
cout << arr[i] << " ";
cout << "\nSum of all elements: " << accumulate(arr, arr + n, 0);
}

## Output

Array is like: 12 45 74 32 66 96 21 32 27
Sum of all elements: 405