Natural numbers are those positive whole numbers starting from 1 (1, 2, 3, 4, ...). In this article, we will learn to write a C++ program to calculate the sum of the first N natural numbers.
For example:
Input: 6
Output: 21
Explanation: 1+2+3+4+5+6 = 21
Algorithm
1. Initialize a variable sum = 0.
2. Run a loop from i = 1 to n.
3. Inside the loop, add the value of i to the current value of sum for each iteration i.e. (sum = sum + i).
4. After the loop, the variable sum will hold the sum of the first n natural numbers.
Code Implementation
#include <iostream>
using namespace std;
int findSum(int n){
int sum = 0;
for (int i = 1; i <= n; i++)
sum = sum + i;
return sum;
}
int main(){
int n = 5;
cout << findSum(n);
return 0;
}
Output
15
