Sum of even numbers at even position

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++) {                if ((i % 2 == 0) &&              (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++) {                        if ((i % 2 == 0) &&                  (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):         if ((i % 2 == 0) and               (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++) {                        if ((i % 2 == 0) &&                  (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



Output:

Sum of even numbers at even indices is 30

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