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Program to find sum of elements in a given array
• Difficulty Level : Easy
• Last Updated : 09 Jun, 2021

Given an array of integers, find sum of its elements.
Examples :

```Input : arr[] = {1, 2, 3}
Output : 6
1 + 2 + 3 = 6

Input : arr[] = {15, 12, 13, 10}
Output : 50```

## C++

 `/* C++ Program to find sum of elements``in a given array */``#include ``using` `namespace` `std;` `// function to return sum of elements``// in an array of size n``int` `sum(``int` `arr[], ``int` `n)``{``    ``int` `sum = 0; ``// initialize sum` `    ``// Iterate through all elements``    ``// and add them to sum``    ``for` `(``int` `i = 0; i < n; i++)``    ``sum += arr[i];` `    ``return` `sum;``}` `// Driver code``int` `main()``{``    ``int` `arr[] = {12, 3, 4, 15};``    ``int` `n = ``sizeof``(arr) / ``sizeof``(arr);``    ``cout << ``"Sum of given array is "` `<< sum(arr, n);``    ``return` `0;``}` `// This code is contributed by rathbhupendra`

## C

 `/* C Program to find sum of elements`` ``in a given array */``#include ` `// function to return sum of elements``// in an array of size n``int` `sum(``int` `arr[], ``int` `n)``{``    ``int` `sum = 0; ``// initialize sum` `    ``// Iterate through all elements``    ``// and add them to sum``    ``for` `(``int` `i = 0; i < n; i++)``    ``sum += arr[i];` `    ``return` `sum;``}` `int` `main()``{``    ``int` `arr[] = {12, 3, 4, 15};``    ``int` `n = ``sizeof``(arr) / ``sizeof``(arr);``    ``printf``(``"Sum of given array is %d"``, sum(arr, n));``    ``return` `0;``}`

## Java

 `/* Java Program to find sum of elements in a given array  */``class` `Test``{``     ``static` `int` `arr[] = {``12``,``3``,``4``,``15``};``     ` `     ``// method for sum of elements in an array``     ``static` `int` `sum()``     ``{``         ``int` `sum = ``0``; ``// initialize sum``         ``int` `i;``      ` `         ``// Iterate through all elements and add them to sum``         ``for` `(i = ``0``; i < arr.length; i++)``            ``sum +=  arr[i];``      ` `         ``return` `sum;``     ``}``     ` `     ``// Driver method``     ``public` `static` `void` `main(String[] args)``     ``{``         ``System.out.println(``"Sum of given array is "` `+ sum());``        ``}`` ``}`

## Python3

 `# Python 3 code to find sum``# of elements in given array``def` `_sum(arr,n):``    ` `    ``# return sum using sum``    ``# inbuilt sum() function``    ``return``(``sum``(arr))` `# driver function``arr``=``[]``# input values to list``arr ``=` `[``12``, ``3``, ``4``, ``15``]` `# calculating length of array``n ``=` `len``(arr)` `ans ``=` `_sum(arr,n)` `# display sum``print` `(``'Sum of the array is '``,ans)` `# This code is contributed by Himanshu Ranjan`

## C#

 `// C# Program to find sum of elements in a``// given array``using` `System;` `class` `GFG {``    ` `    ``// method for sum of elements in an array``    ``static` `int` `sum(``int` `[]arr, ``int` `n)``    ``{``        ` `        ``int` `sum = 0; ``// initialize sum``        ` `        ``// Iterate through all elements and``        ``// add them to sum``        ``for` `(``int` `i = 0; i < n; i++)``            ``sum += arr[i];``        ` `        ``return` `sum;``    ``}``    ` `    ``// Driver method``    ``public` `static` `void` `Main()``    ``{``        ` `        ``int` `[]arr = {12,3,4,15};``        ``int` `n = arr.Length;``        ` `        ``Console.Write(``"Sum of given array is "``                               ``+ sum(arr, n));``    ``}` `}` `// This code is contributed by Sam007.`

## PHP

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## Javascript

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Output :

`Sum of given array is 34`

Time Complexity: O(n)

Auxiliary Space: O(1)

Another Method: Using STL
Calling inbuilt function for sum of elements of an array in STL.
accumulate(first, last, sum);
first, last : first and last elements of range
whose elements are to be added
sum :  initial value of the sum

This function returns the array sum.

## C++

 `/* C++ Program to find sum of elements``in a given array */``#include ``using` `namespace` `std;` `// Driver code``int` `main()``{``    ``int` `arr[] = {12, 3, 4, 15};``    ``int` `n = ``sizeof``(arr) / ``sizeof``(arr);``      ``// calling accumulate function, passing first, last element and``    ``// initial sum, which is 0 in this case.``    ``cout << ``"Sum of given array is "` `<< accumulate(arr, arr + n, 0);``    ``return` `0;``}` `// This code is contributed by pranoy_coder`

## Python3

 `# Python3 program to find sum of elements``# in a given array` `# Driver code``if` `__name__ ``=``=` `"__main__"``:``  ` `    ``arr ``=` `[ ``12``, ``3``, ``4``, ``15` `]``    ``n ``=` `len``(arr)``    ` `    ``# Calling accumulate function, passing``    ``# first, last element and initial sum,``    ``# which is 0 in this case.``    ``print``(``"Sum of given array is "``, ``sum``(arr));` `# This code is contributed by ukasp`
Output
`Sum of given array is 34`

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