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Java Program to Calculate Sum of Natural Numbers

A Java program to calculate the sum of natural numbers up to a given number.

Problem Description

Write a Java program to calculate the sum of natural numbers from 1 to n.

Code

SumNatural.java
public class SumNatural {
    public static void main(String[] args) {
        int num = 100, sum = 0;

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

        System.out.println("Sum = " + sum);
    }
}

Output

Sum = 5050

Explanation

  1. Loop: Iterates from 1 to num.
  2. Accumulator: Adds the current value of i to sum in each iteration.

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