# Program for average of an array (Iterative and Recursive)

Given an array, the task is to find average of that array. Average is the sum of array elements divided by the number of elements.

Examples :

```Input : arr[] = {1, 2, 3, 4, 5}
Output : 3
Sum of the elements is 1+2+3+4+5 = 15
and total number of elements is 5.
So average is 15/5 = 3

Input : arr[] = {5, 3, 6, 7, 5, 3}
Output : 4.83333
Sum of the elements is 5+3+6+7+5+3 = 29
and total number of elements is 6.
So average is 29/6 = 4.83333.
```

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

Iterative:
Iterative program is easy. We need to find sum and divide sum by total number of elements.

## C++

 `// C++ program to calculate average of array elements ` `#include ` `using` `namespace` `std; ` ` `  `// Function that return average of an array. ` `double` `average(``int` `a[], ``int` `n) ` `{ ` `    ``// Find sum of array element ` `    ``int` `sum = 0; ` `    ``for` `(``int` `i=0; i

## Java

 `// Java program to calculate average of array elements ` `class` `GFG { ` `     `  `    ``// Function that return average of an array. ` `    ``static` `double` `average(``int` `a[], ``int` `n) ` `    ``{ ` `         `  `        ``// Find sum of array element ` `        ``int` `sum = ``0``; ` `         `  `        ``for` `(``int` `i = ``0``; i < n; i++) ` `            ``sum += a[i]; ` `     `  `        ``return` `sum / n; ` `    ``} ` `     `  `    ``//driver code ` `    ``public` `static` `void` `main (String[] args) ` `    ``{ ` `         `  `        ``int` `arr[] = {``10``, ``2``, ``3``, ``4``, ``5``, ``6``, ``7``, ``8``, ``9``}; ` `        ``int` `n = arr.length; ` `     `  `        ``System.out.println(average(arr, n)); ` `    ``} ` `} ` ` `  `// This code is contributed by Anant Agarwal. `

## Python3

 `# Python3 code to calculate  ` `# average of array elements ` ` `  `# Function that return  ` `# average of an array. ` `def` `average( a , n ): ` ` `  `    ``# Find sum of array element ` `    ``sum` `=` `0` `    ``for` `i ``in` `range``(n): ` `        ``sum` `+``=` `a[i] ` `     `  `    ``return` `sum``/``n; ` ` `  `# Driver code ` `arr ``=` `[``10``, ``2``, ``3``, ``4``, ``5``, ``6``, ``7``, ``8``, ``9``] ` `n ``=` `len``(arr) ` `print``(average(arr, n)) ` ` `  `# This code is contrbuted by "Shard_Bhardwaj". `

## C#

 `// C# program to calculate average of ` `// array elements ` `using` `System; ` `class` `GFG { ` `     `  `    ``// Function that return average of  ` `    ``// an array. ` `    ``static` `double` `average(``int` `[]a, ``int` `n) ` `    ``{ ` `         `  `        ``// Find sum of array element ` `        ``int` `sum = 0; ` `         `  `        ``for` `(``int` `i = 0; i < n; i++) ` `            ``sum += a[i]; ` `     `  `        ``return` `sum / n; ` `    ``} ` `     `  `    ``// Driver code ` `    ``public` `static` `void` `Main () ` `    ``{ ` `         `  `        ``int` `[]arr = {10, 2, 3, 4, 5, 6,  ` `                                ``7, 8, 9}; ` `        ``int` `n = arr.Length; ` `     `  `        ``Console.Write(average(arr, n)); ` `    ``} ` `} ` ` `  `// This code is contributed by nitin mittal. `

## PHP

 ` `

Output:

```6
```

Recursive:
The idea is to pass index of element as an additional parameter and recursively compute sum. After computing sum, divide the sum by n.

## C++

 `// C++ program to calculate average of array elements ` `#include ` `using` `namespace` `std; ` ` `  `// Recursively computes average of a[] ` `double` `avgRec(``int` `a[], ``int` `i, ``int` `n) ` `{ ` `    ``// Last element ` `    ``if` `(i == n-1) ` `        ``return` `a[i]; ` ` `  `    ``// When index is 0, divide sum computed so ` `    ``// far by n. ` `    ``if` `(i == 0) ` `        ``return` `((a[i] + avgRec(a, i+1, n))/n); ` ` `  `    ``// Compute sum ` `    ``return` `(a[i] + avgRec(a, i+1, n)); ` `} ` ` `  `// Function that return average of an array. ` `double` `average(``int` `a[], ``int` `n) ` `{ ` `     ``return` `avgRec(a, 0, n); ` `} ` ` `  `// Driver code ` `int` `main() ` `{ ` `    ``int` `arr[] = {10, 2, 3, 4, 5, 6, 7, 8, 9}; ` `    ``int` `n = ``sizeof``(arr)/``sizeof``(arr); ` ` `  `    ``cout << average(arr, n) << endl; ` `    ``return` `0; ` `} `

## Java

 `// Java program to calculate average  ` `// of array elements ` ` `  `class` `CalcAvg ` `{ ` `    ``// Recursively computes average of a[] ` `    ``static` `double` `avgRec(``int` `a[], ``int` `i, ``int` `n) ` `    ``{ ` `        ``// Last element ` `        ``if` `(i == n-``1``) ` `            ``return` `a[i]; ` `      `  `        ``// When index is 0, divide sum computed so ` `        ``// far by n. ` `        ``if` `(i == ``0``) ` `            ``return` `((a[i] + avgRec(a, i+``1``, n))/n); ` `      `  `        ``// Compute sum ` `        ``return` `(a[i] + avgRec(a, i+``1``, n)); ` `    ``} ` `      `  `    ``// Function that return average of an array. ` `    ``static` `double` `average(``int` `a[], ``int` `n) ` `    ``{ ` `         ``return` `avgRec(a, ``0``, n); ` `    ``} ` `     `  `    ``// main function ` `    ``public` `static` `void` `main (String[] args)  ` `    ``{ ` `        ``int` `arr[] = {``10``, ``2``, ``3``, ``4``, ``5``, ``6``, ``7``, ``8``, ``9``}; ` `        ``int` `n = arr.length; ` `      `  `        ``System.out.println(average(arr, n)); ` `    ``} ` `} `

## Python3

 `# Python3 code to calculate ` `# average of array elements ` ` `  `# Recursively computes average of a[] ` `def` `avgRec( a , i , n ): ` `     `  `    ``# Last element ` `    ``if` `i ``=``=` `n``-``1``: ` `        ``return` `a[i] ` `     `  `    ``# When index is 0, divide sum ` `    ``# computed so far by n. ` `    ``if` `i ``=``=` `0``: ` `        ``return` `((a[i] ``+` `avgRec(a, i``+``1``, n)) ``/` `n) ` `     `  `    ``# Compute sum ` `    ``return` `(a[i] ``+` `avgRec(a, i``+``1``, n)) ` ` `  `# Function that return  ` `# average of an array. ` `def` `average(a, n): ` `    ``return` `avgRec(a, ``0``, n) ` ` `  `# Driver code ` `arr ``=` `[``10``, ``2``, ``3``, ``4``, ``5``, ``6``, ``7``, ``8``, ``9``] ` `n ``=` `len``(arr) ` `print``(average(arr, n)) ` ` `  `# This code is contributed by "Sharad_Bhardwaj". `

## C#

 `// C# program to calculate average  ` `// of array elements ` `using` `System; ` ` `  `class` `GFG { ` `     `  `    ``// Recursively computes average of a[] ` `    ``static` `double` `avgRec(``int` `[]a, ``int` `i, ``int` `n) ` `    ``{ ` `         `  `        ``// Last element ` `        ``if` `(i == n-1) ` `            ``return` `a[i]; ` `     `  `        ``// When index is 0, divide sum  ` `        ``// computed so far by n. ` `        ``if` `(i == 0) ` `            ``return` `((a[i] + avgRec(a, i+1, n))/n); ` `     `  `        ``// Compute sum ` `        ``return` `(a[i] + avgRec(a, i+1, n)); ` `    ``} ` `     `  `    ``// Function that return average of an array. ` `    ``static` `double` `average(``int` `[]a, ``int` `n) ` `    ``{ ` `        ``return` `avgRec(a, 0, n); ` `    ``} ` `     `  `    ``// main function ` `    ``public` `static` `void` `Main ()  ` `    ``{ ` `        ``int` `[]arr = {10, 2, 3, 4, 5, 6, 7, 8, 9}; ` `        ``int` `n = arr.Length; ` `     `  `        ``Console.Write(average(arr, n)); ` `    ``} ` `} ` ` `  `// This code is contributed by Smitha. `

## PHP

 ` `

Output :

```6
```

Related Article :
Average of a stream of numbers

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