Sum of n Natural Numbers

Program to calculate sum of first n natural numbers

BeginnerTopic: Loop Programs
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C++ Sum of n Natural Numbers Program

This program helps you to learn the fundamental structure and syntax of C++ programming.

Try This Code
#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 of first " << n << " natural numbers = " << sum << endl;
    
    return 0;
}
Output
Enter a positive integer: 10
Sum of first 10 natural numbers = 55

Understanding Sum of n Natural Numbers

This program calculates the sum of natural numbers from 1 to n using a for loop. We initialize sum to 0, then add each number from 1 to n to the sum. The result is the sum of the arithmetic series: 1 + 2 + 3 + ... + n.

Note: To write and run C++ programs, you need to set up the local environment on your computer. Refer to the complete article Setting up C++ Development Environment. If you do not want to set up the local environment on your computer, you can also use online IDE to write and run your C++ programs.

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Factorial of a Number
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Multiplication Table
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Factorial of a Number

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