Java program to calculate n-th element of Triangle Numbers sequence.
import java.util.Scanner; // ? 2017 TheFlyingKeyboard and released under MIT License // theflyingkeyboard.net public class TriangleNumber { public static void main(String[] args) { Scanner input = new Scanner(System.in); int n; System.out.print("Enter number: "); n = input.nextInt(); System.out.print(n + "-th triangle number is equal to " + calculateTriangleNum(n)); } static int calculateTriangleNum(int n) { return (n * (n + 1)) / 2; } }
Java Triangle Number