In the previous article, we have discussed Java Program to Check Triangular Number

In this article we are going to understand what Triangular number is and how we can check whether a number is Triangular or not in Java with examples.

## Program to Check Goldbach Number

**Goldbach numbers** are even integer numbers that can be divided into two odd primes. (All integers above 4 are GoldBach Number.)

Example : 6 = 3+3 16 = 13 + 3

In the above examples the numbers are Goldbach numbers as they are sum of two odd primes.

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**Approach :**

- Enter/declare a number and store it .
- We check whether the number is greater than 4 or not, if not it is not a Goldbach number.
- Then we start subtracting the prime numbers from this, until we find another prime.
- If two primes are found then that number is said to be a Goldbach Number.

**Program:**

import java.util.Scanner; public class GoldbachNumber{ public static void main(String args[]) { //Taking the number as input from the user using scanner class Scanner scan = new Scanner(System.in); System.out.print("Enter a number : "); int num = scan.nextInt(); int temp; boolean flag = false; // Checks if the number is above 4 then goes into the loop if(num>4) { // Runs a loop from 3 to the num until the break condition is met for(int i = 3; i<num; i+=2) { // Checks whether the current number is prime else goes out if(isPrime(i)) { // Finds the other number and checks if it is prime number temp = num - i; if(isPrime(temp)) { flag = true; break; } } } } if(flag) { System.out.println(num+" is a Goldbach number"); } else { System.out.println(num+" is Not a Goldbach number"); } } // Function to check for prime static boolean isPrime(int num) { int iter = 2; boolean flag = true; while (num > iter) { if (num % iter == 0) { flag = false; break; } iter++; } return flag; } }

Output: Enter a number : 16 16 is a Goldbach number

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