Find consecutive numbers whose sum is equal to input number.

In this section, you will learn how to display the consecutive natural numbers whose sum is equal to the input number. For this purpose, the user is allowed to input a positive natural number. The code then takes the number N given by the user and finds all possible combination of consecutive naturalnumbers which add up to give the N. We have used StringBuffer class to hold the combination of consecutive natural numbers which sum up to given number.

Here is the code:

import java.util.*;

public class ConsecutiveNum{
	public static void main(String[] args) {
		int num;
		Scanner input = new Scanner(System.in);
		System.out.println("Enter a number");
		num = input.nextInt();
		for (int i = 1; i < num; i++) {
			StringBuffer sb = new StringBuffer();
			int sum = i;
			sb.append(i).append(" ");
			for (int j = i + 1; sum < num; j++) {
				sb.append(j).append(" ");
				sum = sum + j;
				if (sum == num) {
				System.out.println(sb.toString());
				}
			}
		}
	}
}

Output:

Enter a number
15
1 2 3 4 5
4 5 6
7 8

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