# Product of all pairwise consecutive elements in an Array

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
```

## Recommended: Please try your approach on {IDE} first, before moving on to the solution.

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++ 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[0]); ` ` `  `    ``pairwiseProduct(arr, n); ` ` `  `    ``return` `0; ` `} `

 `// 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 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# 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) `

 ` `

Output:
```40  150  75  30
```

Time complexity : O(n)

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