Find the average of first N natural numbers
Write a program to find the Average of first N natural number.
Examples:
Input : 10 Output : 5.5 1+2+3+4+5+6+7+8+9+10 = 5.5 Input : 7 Output : 4.0 1+2+3+4+5+6+7 = 4
Prerequisite : Sum of first n natural numbers.
As discussed in previous post, sum of n natural number n(n+1)/2, we find the Average of n natural number so divide by n is n(n+1)/2*n = (n+1)/2. Here 1 if first term and n is last term.
C++
// CPP Program to find the Average of first // n natural numbers #include <bits/stdc++.h> using namespace std; // Return the average of first n natural numbers float avgOfFirstN(int n) { return (float)(1 + n)/2; } // Driven Program int main() { int n = 20; cout << avgOfFirstN(n) << endl; return 0; } |
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Java
// Java Program to find the Average of first // n natural numbers import java.io.*; class GFG { // Return the average of first n // natural numbers static float avgOfFirstN(int n) { return (float)(1 + n) / 2; } // Driven Program public static void main(String args[]) { int n = 20; System.out.println(avgOfFirstN(n)); } } /*This code is contributed by Nikita tiwari.*/ |
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Python3
# Python 3 Program to find the Average # of first n natural numbers # Return the average of first n # natural numbers def avgOfFirstN(n) : return (float)(1 + n) / 2; # Driven Program n = 20print(avgOfFirstN(n)) # This code is contributed by Nikita Tiwari. |
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C#
// C#Program to find the Average of first // n natural numbers using System; class GFG { // Return the average of first n // natural numbers static float avgOfFirstN(int n) { return (float)(1 + n) / 2; } // Driven Program public static void Main() { int n = 20; Console.WriteLine(avgOfFirstN(n)); } } /*This code is contributed by vt_m.*/ |
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PHP
<?php // PHP Program to find // the Average of first // n natural numbers // Return the average // of first n natural // numbers function avgOfFirstN($n) { return (float)(1 + $n) / 2; } // Driver Code $n = 20; echo(avgOfFirstN($n)); // This code is contributed by Ajit. ?> |
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Output:
10.5
Time Complexity : O(1)
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