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Program for harmonic mean of numbers in C++
Given with an array of natural numbers and the task is to calculate the harmonic mean of given numbers and print it.
What is harmonic mean?
Harmonic mean means the reciprocal of the arithmetic mean by their reciprocals.
$$Harmonic\: Mean=\frac{n}{\frac{1}{a}+\frac{1}{b}+\frac{1}{c}+...}$$
Where, n is the total number of elements given and a, b, c,.. are the actual elements in an array.
Steps to calculate the harmonic mean are −
Do the reciprocal of the elements
Add all the reciprocated elements together
Now divide the total number of elements in an array by the sum of reciprocated elements
Input
arr[] = {2.0, 3.4, 5.3, 2.1}Output
Harmonic mean is: 2.74163
Input
arr[] = {13.5, 14.5, 14.8, 15.2, 16.1}Output
Harmonic mean is : 14.7707
Algorithm
Start
Step 1→ declare function to calculate harmonic mean of numbers
float harmonic_mean(float arr[], int size)
Declare float sum = 0
Loop For int i = 0 and i < size and i++
Set sum = sum + (float)1 / arr[i]
End
return (float)size/sum
Step 2→ In main()
Declare float arr[] = {2.0, 3.4, 5.3, 2.1}
Declare int size = sizeof(arr) / sizeof(arr[0])
Call harmonic_mean(arr, size)
StopExample
#include <bits/stdc++.h>
using namespace std;
//calculate harmonic mean
float harmonic_mean(float arr[], int size){
float sum = 0;
for (int i = 0; i < size; i++)
sum = sum + (float)1 / arr[i];
return (float)size/sum;
}
int main(){
float arr[] = {2.0, 3.4, 5.3, 2.1};
int size = sizeof(arr) / sizeof(arr[0]);
cout<<"Harmonic mean is : "<<harmonic_mean(arr, size);
return 0;
}Output
If run the above code it will generate the following output −
Harmonic mean is : 2.74163
Updated on: 13-Aug-2020
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