Average of first n natural numbers
The average of the first n natural numbers refers to the sum of the first n natural numbers divided by n.
The natural numbers are the positive integers that start from 1, so the first n natural numbers are 1, 2, 3, ..., n.
The formula for the average of the first n natural numbers is:
Average = (1 + 2 + 3 + ... + n) / n
For example, if we want to find the average of the first 5 natural numbers, we can use the formula:
Average = (1 + 2 + 3 + 4 + 5) / 5 = 15 / 5 = 3
Therefore, the average of the first 5 natural numbers is 3.
Program Solution
// C Program
// Average of first n natural numbers
#include <stdio.h>
void findAverage(int n)
{
if (n <= 0)
{
return;
}
// Calculate sum of n natural number
// Formula = (n × (n + 1)) / 2.0
double sum = (n * (n + 1)) / 2.0;
// Calculate Average
double average = sum / n;
// Display calculated result
printf("\n %lf", average);
}
int main()
{
int n = 6;
/*
n = 6
---------------------------
1 + 2 + 3 + 4 + 5 + 6 = (21)
----------------------------
21
-- = 3.5
6
*/
findAverage(n);
return 0;
}Output
3.500000// Java program for
// Average of first n natural numbers
public class Average
{
public void findAverage(int n)
{
if (n <= 0)
{
return;
}
// Calculate sum of n natural number
// Formula = (n × (n + 1)) / 2.0
double sum = (n * (n + 1)) / 2.0;
// Calculate Average
double average = sum / n;
// Display calculated result
System.out.print("\n " + average);
}
public static void main(String[] args)
{
Average task = new Average();
int n = 6;
/*
n = 6
---------------------------
1 + 2 + 3 + 4 + 5 + 6 = (21)
----------------------------
21
-- = 3.5
6
*/
task.findAverage(n);
}
}Output
3.5// Include header file
#include <iostream>
using namespace std;
// C++ program for
// Average of first n natural numbers
class Average
{
public: void findAverage(int n)
{
if (n <= 0)
{
return;
}
// Calculate sum of n natural number
// Formula = (n × (n + 1)) / 2.0
double sum = (n *(n + 1)) / 2.0;
// Calculate Average
double average = sum / n;
// Display calculated result
cout << "\n " << average;
}
};
int main()
{
Average *task = new Average();
int n = 6;
/*
n = 6
---------------------------
1 + 2 + 3 + 4 + 5 + 6 = (21)
----------------------------
21
-- = 3.5
6
*/
task->findAverage(n);
return 0;
}Output
3.5// Include namespace system
using System;
// Csharp program for
// Average of first n natural numbers
public class Average
{
public void findAverage(int n)
{
if (n <= 0)
{
return;
}
// Calculate sum of n natural number
// Formula = (n × (n + 1)) / 2.0
double sum = (n * (n + 1)) / 2.0;
// Calculate Average
double average = sum / n;
// Display calculated result
Console.Write("\n " + average);
}
public static void Main(String[] args)
{
Average task = new Average();
int n = 6;
/*
n = 6
---------------------------
1 + 2 + 3 + 4 + 5 + 6 = (21)
----------------------------
21
-- = 3.5
6
*/
task.findAverage(n);
}
}Output
3.5package main
import "fmt"
// Go program for
// Average of first n natural numbers
type Average struct {}
func getAverage() * Average {
var me *Average = &Average {}
return me
}
func(this Average) findAverage(n int) {
if n <= 0 {
return
}
// Calculate sum of n natural number
// Formula = (n × (n + 1)) / 2.0
var sum float64 = float64(n * (n + 1)) / 2.0
// Calculate Average
var average float64 = sum / float64(n)
// Display calculated result
fmt.Print("\n ", average)
}
func main() {
var task * Average = getAverage()
var n int = 6
/*
n = 6
---------------------------
1 + 2 + 3 + 4 + 5 + 6 = (21)
----------------------------
21
-- = 3.5
6
*/
task.findAverage(n)
}Output
3.5<?php
// Php program for
// Average of first n natural numbers
class Average
{
public function findAverage($n)
{
if ($n <= 0)
{
return;
}
// Calculate sum of n natural number
// Formula = (n × (n + 1)) / 2.0
$sum = ($n * ($n + 1)) / 2.0;
// Calculate Average
$average = $sum / $n;
// Display calculated result
echo("\n ".$average);
}
}
function main()
{
$task = new Average();
$n = 6;
/*
n = 6
---------------------------
1 + 2 + 3 + 4 + 5 + 6 = (21)
----------------------------
21
-- = 3.5
6
*/
$task->findAverage($n);
}
main();Output
3.5// Node JS program for
// Average of first n natural numbers
class Average
{
findAverage(n)
{
if (n <= 0)
{
return;
}
// Calculate sum of n natural number
// Formula = (n × (n + 1)) / 2.0
var sum = (n * (n + 1)) / 2.0;
// Calculate Average
var average = sum / n;
// Display calculated result
process.stdout.write("\n " + average);
}
}
function main()
{
var task = new Average();
var n = 6;
/*
n = 6
---------------------------
1 + 2 + 3 + 4 + 5 + 6 = (21)
----------------------------
21
-- = 3.5
6
*/
task.findAverage(n);
}
main();Output
3.5# Python 3 program for
# Average of first n natural numbers
class Average :
def findAverage(self, n) :
if (n <= 0) :
return
# Calculate sum of n natural number
# Formula = (n × (n + 1)) / 2.0
sum = (n * (n + 1)) / 2.0
# Calculate Average
average = sum / n
# Display calculated result
print("\n ", average, end = "")
def main() :
task = Average()
n = 6
# n = 6
# ---------------------------
# 1 + 2 + 3 + 4 + 5 + 6 = (21)
# ----------------------------
# 21
# -- = 3.5
# 6
task.findAverage(n)
if __name__ == "__main__": main()Output
3.5# Ruby program for
# Average of first n natural numbers
class Average
def findAverage(n)
if (n <= 0)
return
end
# Calculate sum of n natural number
# Formula = (n × (n + 1)) / 2.0
sum = (n * (n + 1)) / 2.0
# Calculate Average
average = sum / n
# Display calculated result
print("\n ", average)
end
end
def main()
task = Average.new()
n = 6
# n = 6
# ---------------------------
# 1 + 2 + 3 + 4 + 5 + 6 = (21)
# ----------------------------
# 21
# -- = 3.5
# 6
task.findAverage(n)
end
main()Output
3.5// Scala program for
// Average of first n natural numbers
class Average()
{
def findAverage(n: Int): Unit = {
if (n <= 0)
{
return;
}
// Calculate sum of n natural number
// Formula = (n × (n + 1)) / 2.0
var sum: Double = (n * (n + 1)) / 2.0;
// Calculate Average
var average: Double = sum / n;
// Display calculated result
print("\n " + average);
}
}
object Main
{
def main(args: Array[String]): Unit = {
var task: Average = new Average();
var n: Int = 6;
/*
n = 6
---------------------------
1 + 2 + 3 + 4 + 5 + 6 = (21)
----------------------------
21
-- = 3.5
6
*/
task.findAverage(n);
}
}Output
3.5// Swift 4 program for
// Average of first n natural numbers
class Average
{
func findAverage(_ n: Int)
{
if (n <= 0)
{
return;
}
// Calculate sum of n natural number
// Formula = (n × (n + 1)) / 2.0
let sum: Double = Double(n * (n + 1)) / 2.0;
// Calculate Average
let average: Double = sum / Double(n);
// Display calculated result
print("\n ", average, terminator: "");
}
}
func main()
{
let task: Average = Average();
let n: Int = 6;
/*
n = 6
---------------------------
1 + 2 + 3 + 4 + 5 + 6 = (21)
----------------------------
21
-- = 3.5
6
*/
task.findAverage(n);
}
main();Output
3.5// Kotlin program for
// Average of first n natural numbers
class Average
{
fun findAverage(n: Int): Unit
{
if (n <= 0)
{
return;
}
// Calculate sum of n natural number
// Formula = (n × (n + 1)) / 2.0
val sum: Double = (n * (n + 1)) / 2.0;
// Calculate Average
val average: Double = sum / n;
// Display calculated result
print("\n " + average);
}
}
fun main(args: Array < String > ): Unit
{
val task: Average = Average();
val n: Int = 6;
/*
n = 6
---------------------------
1 + 2 + 3 + 4 + 5 + 6 = (21)
----------------------------
21
-- = 3.5
6
*/
task.findAverage(n);
}Output
3.5
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