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# C++ Program to Calculate Sum of Natural Numbers

#### In this example, you’ll learn to calculate the sum of natural numbers.

To understand this example, you should have the knowledge of the following C++ programming topics:

• C++ for Loop

Positive integers 1, 2, 3, 4… are known as natural numbers.

This program takes a positive integer from user( suppose user entered n ) then, this program displays the value of 1+2+3+….+n.

## Example: Sum of Natural Numbers using loop

``````
#include <iostream>
using namespace std;

int main(){
int n, sum = 0;

cout << "Enter a positive integer: ";
cin >> n;

for (int i = 1; i <= n; ++i) {
sum += i;
}

cout << "Sum = " << sum;
return 0;
}``````

Output

```Enter a positive integer: 50
Sum = 1275```

This program assumes that user always enters positive number.

If user enters negative number, Sum = 0 is displayed and program is terminated.

This program can also be done using recursion.

## C++ for Beginners: C++ Program to Calculate Sum of Natural Numbers

#### Free Machine Learning & Data Science Coding Tutorials in Python & R for Beginners. Subscribe @ Western Australian Center for Applied Machine Learning & Data Science. ```