Question

Program to print all prime triplets in a given range

				
					ENTER LOWER RANGE
1
ENTER UPPER RANGE
20
PRIME TRIPLET BETWEEN 1 and 20
(5,7,11)
(7,11,13)
(11,13,17)
(13,17,19)
(17,19,23)

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Code

				
					import java.util.Scanner;
public class PrimeTripletInGivenRange
{
    public static boolean isPrime(int num)
    {

        int j=0,count=0;      
        boolean flag=true;  
        if(num>1)
        {  
            for(j=1;j<=num;j++)  
            {
                /*Checking if number is divisible by j.*/
                if(num%j==0)
                {      
                    count++;   
                }      
            }
            if(count==2)
            {
                return true; 
            }
            else
            {
                return false;
            }
        }
        else
        {
            return false;   
        }
    }      

    public static void main()
    {
        int lowerRange=0,upperRange=0,i=0;
        Scanner sc=new Scanner(System.in);
        System.out.println("ENTER LOWER RANGE");
        lowerRange=sc.nextInt();
        System.out.println("ENTER UPPER RANGE");
        upperRange=sc.nextInt();
        System.out.println("PRIME TRIPLET BETWEEN "+lowerRange+" and "+upperRange);

        for(i=lowerRange;i<=upperRange;i++)
        {
            if(i>4)
            {
                if(isPrime(i)==true&&isPrime(i+2)==true && isPrime(i+6)==true)
                {
                    System.out.println("("+i+","+(i+2)+","+(i+6)+")");
                }
                if(isPrime(i)==true&&isPrime(i+4)==true && isPrime(i+6)==true)
                {
                    System.out.println("("+i+","+(i+4)+","+(i+6)+")");

                }
            }
        }
    }
}