SPECIAL PRIME NUMBER

 JAVA PROGRAM TO PRINT THE LARGEST SPECIAL PRIME NUMBER FROM THE GIVEN NUMBER 

I/P:

100

O/P:

79

PROGRAM:

package Numbers;

import java.util.*;

public class LargestSpecialPrime

{

    public static void main(String[] args) {

        Scanner sc=new Scanner(System.in);

        int iNum=sc.nextInt();

        sc.close();

        for(int k=iNum;k>0;k--)

        {

           

        int count=0;

        String s1=Integer.toString(k);

    

        int flag=0;

        int dup=0;

        dup=k;

        int d=0;

    

            while(dup>0)

            {

             

                for(int i=2;i<=dup/2;i++)

                {

                    if(dup%i==0)

                    {

                        flag=1;

                      

                        break;

                    }

                }

                if(flag==0)

                {

                    count++;

                  

                }

                if(count==s1.length())

                { 

                    d=1;    

                }

             

                dup=dup/10;

            }

            if(d==1)

            {

                System.out.println(k);

                break;

            }

            s1="";

        

        }

    }

}