Twin Prime Numbers are numbers who have a difference of two and both of the numbers are Prime Numbers.
Example 1: 3 and 5. 5-3 = 2. Also 3 and 5 both are Prime Numbers. Hence they are Twin Prime Numbers.
Example 2: 3 and 7. 7-3 = 4. Here though 3 and 7 both are Prime Numbers their difference is not two. Hence they are not Twin Prime Numbers.
Java
import java.util.*;
public class TwinPrimeNumber
{
public static void main(String args[])
{
int n1=0,n2=0,flag=0;
Scanner sc=new Scanner(System.in);
System.out.println("Enter two numbers:-");
n1=sc.nextInt();
n2=sc.nextInt();
if(Math.abs(n1-n2)==2)
{
for(int i=1;i<=n1;i++)
{
if(n1%i==0)
{
flag++;
}
}
if(flag==2)
{
flag=0;
for(int i=1;i<=n2;i++)
{
if(n2%i==0)
{
flag++;
}
}
if(flag==2)
{
System.out.println(n1+" and "+n2+" are Twin Prime Numbers");
}
}
}
if(flag!=2)
{
System.out.println(n1+" and "+n2+" are not Twin Prime Numbers");
}
}
}