Prerequisite – Array Basics

Given an array, write a program to find the sum of values of even and odd index positions separately.

Examples:

Input :arr = {1, 2, 3, 4, 5, 6}Output :Even index positions sum 9 Odd index positions sum 12Explanation:Here, n = 6 so there will be 3 even index positions and 3 odd index positions in an array Even = 1 + 3 + 5 = 9 Odd = 2 + 4 + 6 = 12Input :arr = {10, 20, 30, 40, 50, 60, 70}Output :Even index positions sum 160 Odd index positions sum 170Explanation:Here, n = 7 so there will be 3 odd index positions and 4 even index positions in an array Even = 10 + 30 + 50 + 70 = 160 Odd = 20 + 40 + 60 = 120

## C/C++

`// CPP program to find out ` `// Sum of elements at even and ` `// odd index positions separately ` `#include <iostream> ` ` ` `using` `namespace` `std; ` ` ` `// Function to calculate sum ` `void` `EvenOddSum(` `int` `arr[], ` `int` `n) ` `{ ` ` ` `int` `even = 0; ` ` ` `int` `odd = 0; ` ` ` `for` `(` `int` `i = 0; i < n; i++) { ` ` ` `// Loop to find even, odd sum ` ` ` `if` `(i % 2 == 0) ` ` ` `even += arr[i]; ` ` ` `else` ` ` `odd += arr[i]; ` ` ` `} ` ` ` ` ` `cout << ` `"Even index positions sum "` `<< even; ` ` ` `cout << ` `"\nOdd index positions sum "` `<< odd; ` `} ` ` ` `// Driver function ` `int` `main() ` `{ ` ` ` `int` `arr[] = { 1, 2, 3, 4, 5, 6 }; ` ` ` `int` `n = ` `sizeof` `(arr) / ` `sizeof` `(arr[0]); ` ` ` ` ` `EvenOddSum(arr, n); ` ` ` ` ` `return` `0; ` `} ` |

*chevron_right*

*filter_none*

## Java

`// Java program to find out ` `// Sum of elements at even and ` `// odd index positions separately ` `import` `java.io.*; ` ` ` `class` `EvenOddSum { ` ` ` `public` `static` `void` `main(String args[]) ` ` ` `{ ` ` ` `int` `arr[] = { ` `1` `, ` `2` `, ` `3` `, ` `4` `, ` `5` `, ` `6` `}; ` ` ` `int` `even = ` `0` `, odd = ` `0` `; ` ` ` ` ` `// Loop to find even, odd sum ` ` ` `for` `(` `int` `i = ` `0` `; i < arr.length; i++) { ` ` ` `if` `(i % ` `2` `== ` `0` `) ` ` ` `even += arr[i]; ` ` ` `else` ` ` `odd += arr[i]; ` ` ` `} ` ` ` ` ` `System.out.println(` `"Even index positions sum: "` `+ even); ` ` ` `System.out.println(` `"Odd index positions sum: "` `+ odd); ` ` ` `} ` `} ` |

*chevron_right*

*filter_none*

## Python

`# Python program to find out ` `# Sum of elements at even and ` `# odd index positions separately ` ` ` `# Function to calculate Sum ` `def` `EvenOddSum(a, n): ` ` ` `even ` `=` `0` ` ` `odd ` `=` `0` ` ` `for` `i ` `in` `range` `(n): ` ` ` ` ` `# Loop to find evem, odd Sum ` ` ` `if` `i ` `%` `2` `=` `=` `0` `: ` ` ` `even ` `+` `=` `a[i] ` ` ` `else` `: ` ` ` `odd ` `+` `=` `a[i] ` ` ` ` ` `print` `"Even index positions sum "` `, even ` ` ` `print` `"nOdd index positions sum "` `, odd ` ` ` `# Driver Function ` ` ` `arr ` `=` `[` `1` `, ` `2` `, ` `3` `, ` `4` `, ` `5` `, ` `6` `] ` `n ` `=` `len` `(arr) ` ` ` `EvenOddSum(arr, n) ` ` ` `# This code is contributed by Sachin Bisht ` |

*chevron_right*

*filter_none*

## C#

`// C# program to find out ` `// Sum of elements at even and ` `// odd index positions separately ` `using` `System; ` ` ` `public` `class` `GFG { ` ` ` ` ` `public` `static` `void` `Main() ` ` ` `{ ` ` ` `int` `[] arr = { 1, 2, 3, 4, 5, 6 }; ` ` ` `int` `even = 0, odd = 0; ` ` ` ` ` `// Loop to find even, odd sum ` ` ` `for` `(` `int` `i = 0; i < arr.Length; i++) ` ` ` `{ ` ` ` `if` `(i % 2 == 0) ` ` ` `even += arr[i]; ` ` ` `else` ` ` `odd += arr[i]; ` ` ` `} ` ` ` ` ` `Console.WriteLine(` `"Even index positions"` ` ` `+ ` `" sum: "` `+ even); ` ` ` ` ` `Console.WriteLine(` `"Odd index positions "` ` ` `+ ` `"sum: "` `+ odd); ` ` ` `} ` `} ` ` ` `// This code is contributed by Sam007. ` |

*chevron_right*

*filter_none*

## PHP

`<?php ` `// PHP program to find out ` `// Sum of elements at even and ` `// odd index positions separately ` ` ` `// Function to calculate sum ` `function` `EvenOddSum(` `$arr` `, ` `$n` `) ` `{ ` ` ` `$even` `= 0; ` ` ` `$odd` `= 0; ` ` ` `for` `(` `$i` `= 0; ` `$i` `< ` `$n` `; ` `$i` `++) ` ` ` `{ ` ` ` ` ` `// Loop to find even, odd sum ` ` ` `if` `(` `$i` `% 2 == 0) ` ` ` `$even` `+= ` `$arr` `[` `$i` `]; ` ` ` `else` ` ` `$odd` `+= ` `$arr` `[` `$i` `]; ` ` ` `} ` ` ` ` ` `echo` `(` `"Even index positions sum "` `. ` `$even` `); ` ` ` `echo` `(` `"\nOdd index positions sum "` `. ` `$odd` `); ` `} ` ` ` `// Driver Code ` `$arr` `= ` `array` `( 1, 2, 3, 4, 5, 6 ); ` `$n` `= sizeof(` `$arr` `); ` ` ` `EvenOddSum(` `$arr` `, ` `$n` `); ` ` ` `// This code is contributed by Ajit. ` `?> ` |

*chevron_right*

*filter_none*

Output:

Even index positions sum 9 Odd index positions sum 12

This article is contributed by **Rishabh Jain**. If you like GeeksforGeeks and would like to contribute, you can also write an article using contribute.geeksforgeeks.org or mail your article to contribute@geeksforgeeks.org. See your article appearing on the GeeksforGeeks main page and help other Geeks.

Please write comments if you find anything incorrect, or you want to share more information about the topic discussed above.

Attention reader! Don’t stop learning now. Get hold of all the important DSA concepts with the **DSA Self Paced Course** at a student-friendly price and become industry ready.