Related Articles

# Product of all pairwise consecutive elements in an Array

• Difficulty Level : Basic
• Last Updated : 23 Apr, 2021

Given an array of integers of N elements. The task is to print the product of all of the pairwise consecutive elements.
Pairwise consecutive pairs of an array of size N are (a[i], a[i+1]) for all ranging from 0 to N-2
Examples

```Input  : arr[] = {8, 5, 4, 3, 15, 20}
Output : 40, 20, 12, 45, 300

Input  : arr[] = {5, 10, 15, 20}
Output : 50, 150, 300```

Attention reader! All those who say programming isn't for kids, just haven't met the right mentors yet. Join the  Demo Class for First Step to Coding Coursespecifically designed for students of class 8 to 12.

The students will get to learn more about the world of programming in these free classes which will definitely help them in making a wise career choice in the future.

The solution is to traverse the array and calculate and print the product of every pair (arr[i], arr[i+1]).
Below is the implementation of this approach:

## C++

 `// C++ program to print the``// product of the consecutive elements.``#include ``using` `namespace` `std;` `// Function to print pairwise``// consecutive product``void` `pairwiseProduct(``int` `arr[], ``int` `n)``{``    ``int` `prod = 1;``    ``for` `(``int` `i = 0; i < n - 1; i++) {` `        ``// multiply the alternate numbers``        ``prod = arr[i] * arr[i + 1];``        ``printf``(``" %d "``, prod);``    ``}``}` `// Driver Code``int` `main()``{``    ``int` `arr[] = { 4, 10, 15, 5, 6 };``    ``int` `n = ``sizeof``(arr) / ``sizeof``(arr);` `    ``pairwiseProduct(arr, n);` `    ``return` `0;``}`

## Java

 `// Java program to print the product``// of the consecutive elements.``import` `java .io.*;` `class` `GFG``{``// Function to print pairwise``// consecutive product``static` `void` `pairwiseProduct(``int``[] arr,``                            ``int` `n)``{``    ``int` `prod = ``1``;``    ``for` `(``int` `i = ``0``; i < n - ``1``; i++)``    ``{` `        ``// multiply the alternate numbers``        ``prod = arr[i] * arr[i + ``1``];``        ``System.out.print(prod + ``" "``);``    ``}``}` `// Driver Code``public` `static` `void` `main(String[] args)``{``    ``int``[] arr = { ``4``, ``10``, ``15``, ``5``, ``6` `};``    ``int` `n = arr.length;` `    ``pairwiseProduct(arr, n);``}``}` `// This code is contributed``// by anuj_67..`

## Python 3

 `# Python 3 program to print the``# product of the consecutive elements.` `# Function to print pairwise``# consecutive product``def` `pairwiseProduct( arr, n):` `    ``prod ``=` `1``    ``for` `i ``in` `range``(n ``-` `1``) :` `        ``# multiply the alternate numbers``        ``prod ``=` `arr[i] ``*` `arr[i ``+` `1``]``        ``print``(prod, end ``=` `" "``)``    ` `# Driver Code``if` `__name__``=``=``"__main__"``:` `    ``arr ``=` `[ ``4``, ``10``, ``15``, ``5``, ``6` `]``    ``n ``=` `len``(arr)` `    ``pairwiseProduct(arr, n)` `# This code is contributed``# by ChitraNayal`

## C#

 `// C# program to print the product``// of the consecutive elements.``using` `System;` `class` `GFG``{``// Function to print pairwise``// consecutive product``static` `void` `pairwiseProduct(``int``[] arr,``                            ``int` `n)``{``    ``int` `prod = 1;``    ``for` `(``int` `i = 0; i < n - 1; i++)``    ``{` `        ``// multiply the alternate numbers``        ``prod = arr[i] * arr[i + 1];``        ``Console.Write(prod + ``" "``);``    ``}``}` `// Driver Code``public` `static` `void` `Main()``{``    ``int``[] arr = { 4, 10, 15, 5, 6 };``    ``int` `n = arr.Length;` `    ``pairwiseProduct(arr, n);``}``}` `// This code is contributed``// by Akanksha Rai(Abby_akku)`

## PHP

 ``

## Javascript

 ``
Output:
`40  150  75  30`

Time complexity : O(n)

My Personal Notes arrow_drop_up