Learn Java by Example: Java Program to Check Whether a Number can be Expressed as Sum of Two Prime Numbers

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Java Program to Check Whether a Number can be Expressed as Sum of Two Prime Numbers

In this program, you’ll learn to check whether a given number can be expressed as a sum of two prime numbers or not. This is done with the help of loops and break statements in Java.

 


To accomplish this task, checkPrime() function is created.

The checkPrime() returns 1 if the number passed to the function is a prime number.

Example: Integer as a Sum of Two Prime Numbers


public class CheckPrime{

    public static void main(String[] args){
        int number = 34;
        boolean flag = false;
        for (int i = 2; i <= number / 2; ++i) {

            // condition for i to be a prime number
            if (checkPrime(i)) {

                // condition for n-i to be a prime number
                if (checkPrime(number - i)) {

                    // n = primeNumber1 + primeNumber2
                    System.out.printf("%d = %d + %dn", number, i, number - i);
                    flag = true;
                }

            }
        }

        if (!flag)
            System.out.println(number + " cannot be expressed as the sum of two prime numbers.");
    }

    // Function to check prime number
    static boolean checkPrime(int num){
        boolean isPrime = true;

        for (int i = 2; i <= num / 2; ++i) {
            if (num % i == 0) {
                isPrime = false;
                break;
            }
        }

        return isPrime;
    }
}

Output

34 = 3 + 31
34 = 5 + 29
34 = 11 + 23
34 = 17 + 17

 

 

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