Question

Write a program to display twin prime numbers that lie between a given range.(in java)​

Answer 1

Explanation:

import java.io.*;

// Program to check twin prime

public class TwinPrimeNumber

{

public static boolean isPrime(int n)

{

// boolean value will return

boolean f = true;

for (int i = 2; i <= n / 2; i++) {

if (n % i == 0) {

f = false;

break;

}

}

return f;

}

// main method begins

public static void main(String args[]) throws IOException

{

int number1, number2;

// InputStreamReader object

InputStreamReader in = new InputStreamReader(System.in);

// BufferedReader object

BufferedReader br = new BufferedReader(in);

System.out.print("Enter first number: ");

// First number

number1 = Integer.parseInt(br.readLine());

System.out.print("Enter second number: ");

// Second number

number2 = Integer.parseInt(br.readLine());

// Checking both the number is prime and the difference between two is 2

if (isPrime(number1) == true && isPrime(number2) == true && Math.abs(number2 - number1) == 2) {

System.out.println("Twin prime number");

} else {

System.out.println("Not twin prime numbers");

}