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#
Authors:
Michael T. Goodrich, Roberto Tamassia, Michael H. Goldwasser
Chapter:
Java Primer
Exercise:
Exercises
Question:5 | ISBN:9781118771334 | Edition: 6

Question

Write a short Java method that takes an integer n and returns the sum of all positive integers less than or equal to  n.

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Answer

package java_problems_datastructures;

import java.util.Scanner;

public class SumOfIntegers {

	// Driver method
	public static void main(String args[]) {

		Scanner input = new Scanner(System.in);

		System.out.println("please enter a value ");

		int n = input.nextInt();

		System.out.println("sum of all positive integers is: " + sumOfIntegers(n));

		input.close();

	}
     
	//Calculate sum of integers
	private static int sumOfIntegers(int n) {

		// n*(n+1)/2 gives sum of n integers.
		
		int sum = n * (n + 1) / 2;

		return sum;

	}

}

 

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