To find the mean of the elements of the array.
Mean = (Sum of elements of the Array) /
(Total no of elements in Array)
Examples:
Input : 1 2 3 4 5 Output : 3 Input : 1 2 3 Output : 2
To find the mean using recursion assume that the problem is already solved for N-1 ie you have to find for n
Sum of first N-1 elements =
(Mean of N-1 elements)*(N-1)
Mean of N elements = (Sum of first N-1 elements +
N-th elements) / (N)Note : Since array indexing starts from 0, we access N-th element using A[N-1].
C++
// Recursive C program to find mean of array#include<stdio.h> // Function Definiton of findMean functionfloat findMean(int A[], int N){ if (N == 1) return (float)A[N-1]; else return ((float)(findMean(A, N-1)*(N-1) + A[N-1]) / N);} // Main Calling Functionint main(){ float Mean = 0; int A[] = {1, 2, 3, 4, 5}; int N = sizeof(A)/sizeof(A[0]); printf("%.2f\n", findMean(A, N)); return 0;} |
Java
// Recursive Java program to find mean of arrayclass CalcMean{ // Function Definiton of findMean function static float findMean(int A[], int N) { if (N == 1) return (float)A[N-1]; else return ((float)(findMean(A, N-1)*(N-1) + A[N-1]) / N); } // main Function public static void main (String[] args) { float Mean = 0; int A[] = {1, 2, 3, 4, 5}; int N = A.length; System.out.println(findMean(A, N)); }} |
Python3
# Recursive Python3 program to# find mean of array # Function Definiton of findMean functiondef findMean(A, N): if (N == 1): return A[N - 1] else: return ((findMean(A, N - 1) * (N - 1) + A[N - 1]) / N) # Driver CodeMean = 0A = [1, 2, 3, 4, 5]N = len(A)print(findMean(A, N)) # This code is contributed by Anant Agarwal. |
C#
// Recursive C# program to find mean of arrayusing System; class CalcMean{ // Function Definiton of findMean function static float findMean(int []A, int N) { if (N == 1) return (float)A[N - 1]; else return ((float)(findMean(A, N - 1) * (N - 1) + A[N - 1]) / N); } // Driver code public static void Main() { //float Mean = 0; int []A = {1, 2, 3, 4, 5}; int N = A.Length; Console.WriteLine(findMean(A, N)); }} // This code is contributed by Anant Agarwal. |
PHP
<?php// Recursive PHP program to find mean of array // Function Definiton of findMean functionfunction findMean($A, $N){ if ($N == 1) return $A[$N - 1]; else return ((findMean($A, $N - 1) * ($N - 1) + $A[$N - 1]) / $N);} // Driver Code$Mean = 0;$A = array(1, 2, 3, 4, 5);$N = sizeof($A);echo findMean($A, $N); // This code is contributed by ajit.?> |
Output:
3
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