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# Sum of even numbers at even position

• Difficulty Level : Basic
• Last Updated : 17 Mar, 2021

Given an array of size n. The problem is to find the sum of numbers which are even and are at even index.
Examples:

```Input :  arr[] = {5, 6, 12, 1, 18, 8}
Output : 30
Explanation: Here, n = 6
Now here are index and numbers as: index->arr[index]
0->5, 1->6, 2->12, 3->1, 4->18, 5->8
so, number which are even and are at even indices
are: 2->12, 4->18
sum = 12+18 = 30

Input  : arr[] = {3, 20, 17, 9, 2, 10,
18, 13, 6, 18}
Output : 26
Explanation: Here, n = 10
Now here are index and numbers as: index->arr[index]
0->3, 1->20, 2->17, 3->9, 4->2, 5->10,
6->18, 7->13, 8->6, 9->18
So, number which are even and are at even indices are:
4->2, 6->18, 8->6
sum = 2+18+6 = 26```

## C++

 `// C++ implementation to``// find sum of even numbers``// at even indices``#include ``using` `namespace` `std;` `// Function to calculate sum``// of even numbers at even indices``int` `sum_even_and_even_index(``                ``int` `arr[], ``int` `n) {` `    ``int` `i = 0, sum = 0;``    ` `    ``// calculating sum of even``    ``// number at even index``    ``for` `(i = 0; i < n; i+=2) {``    ` `        ``if` `(arr[i] % 2 == 0) {``            ` `            ``sum += arr[i];``        ``}``    ``}``    ` `    ``// required sum``    ``return` `sum;``}` `// Driver program to test above``int` `main() {``    ``int` `arr[] = {5, 6, 12, 1, 18, 8};``    ``int` `n = ``sizeof``(arr) / ``sizeof``(arr);``    ``cout << ``"Sum of even numbers at even indices is "``         ``<< sum_even_and_even_index(arr, n);``    ` `    ``return` `0;``}`

## Java

 `// Java implementation to find sum of``// even numbers at even indices` `import` `java.io.*;` `class` `GFG {``    ` `    ``// Function to calculate sum``    ``// of even numbers at even indices``    ``static` `int` `sum_even_and_even_index(``                       ``int` `arr[], ``int` `n)``    ``{``    ` `        ``int` `i = ``0``, sum = ``0``;``        ` `        ``// calculating sum of even``        ``// number at even index``        ``for` `(i = ``0``; i < n; i+=``2``) {``        ` `            ``if` `(arr[i] % ``2` `== ``0``) {``                ``sum += arr[i];``            ``}``        ``}``        ` `        ``// required sum``        ``return` `sum;``    ``}` `    ``// Driver program to test above``    ``public` `static` `void` `main (String[] args) {``        ` `        ``int` `arr[] = {``5``, ``6``, ``12``, ``1``, ``18``, ``8``};``        ``int` `n = arr.length;``        ``System.out.println(``"Sum of even numbers"``                      ``+ ``" at even indices is "` `+``             ``+ sum_even_and_even_index(arr, n));``    ``}``}` `// This code is contributed by vt_m.`

## Python3

 `# python 3 implementation to``# find sum of even numbers``# at even indices` `# Function to calculate sum``# of even numbers at even indices``def` `sum_even_and_even_index(arr,n):``    ` `    ``i ``=` `0``    ``sum` `=` `0``    ` `# calculating sum of even``# number at even index``    ``for` `i ``in` `range``(``0``,n,``2``):``        ``if` `(arr[i] ``%` `2` `=``=` `0``) :``            ``sum` `+``=` `arr[i]``        ` `    ``# required sum``    ``return` `sum`  `# Driver program to test above``arr ``=` `[``5``, ``6``, ``12``, ``1``, ``18``, ``8``]``n ``=` `len``(arr)``print``(``"Sum of even numbers at "``,``             ``"even indices is "``,``   ``sum_even_and_even_index(arr, n))``    ` `# This code is contributed by Sam007`

## C#

 `// C# implementation to find sum of``// even numbers at even indices` `using` `System;` `class` `GFG {``    ` `    ``// Function to calculate sum``    ``// of even numbers at even indices``    ``static` `int` `sum_even_and_even_index(``                    ``int` `[]arr, ``int` `n)``    ``{``    ` `        ``int` `i = 0, sum = 0;``        ` `        ``// calculating sum of even``        ``// number at even index``        ``for` `(i = 0; i < n; i+=2) {``        ` `            ``if` `(arr[i] % 2 == 0) {``                ` `                ``sum += arr[i];``            ``}``        ``}``        ` `        ``// required sum``        ``return` `sum;``    ``}` `    ``// Driver program to test above``    ``public` `static` `void` `Main () {``        ` `        ``int` `[]arr = {5, 6, 12, 1, 18, 8};``        ``int` `n = arr.Length;``        ``Console.WriteLine(``"Sum of even numbers"``                    ``+ ``" at even indices is "` `+``            ``+ sum_even_and_even_index(arr, n));``    ``}``}` `//This code is contributed by vt_m.`

## PHP

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## Javascript

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Output:

` Sum of even numbers at even indices is 30`

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