Question

Write A Program In Java BlueJ To print and check whether the numbers are Twin Prime or not , using function name as twin() . The Function returns 1 if they are Twin Prime otherwise it returns 0.

(Twin Prime Numbers are those which are primd and there difference is 2)
e.g :- (5,7) , (11,13) , etc.

Answer 1

Answer:

import java.util.Scanner;

public class TwinPrimes {

// Checking Prime number.

static boolean isPrime(int number) {

for (int i = 2; i < number; i++)

if (number % i = = 0)

return false;

return true;

}

// Checking Twin Prime numbers.

static int isTwinPrime(int numOne, int numTwo) {

// Finding their difference is 2 or not

if (Math.abs(numOne - numTwo) != 2)

return 0;

// Checking both numbers for Prime and returning values accordingly.

return (isPrime(numOne) && isPrime(numTwo)) ? 1 : 0;

}

public static void main(String[] args) {

Scanner sc = new Scanner(System.in);

System.out.println("Enter two numbers - ");

int numOne = sc.nextInt( ),

numTwo = sc.nextInt( );

System.out.printf("They are%sTwin Primes.", isTwinPrime(numOne, numTwo) = = 1 ? " " : " not ");

}

}