Question

Print Smith number in given range only using main method.
(A Smith Number is a composite number whose sum of digits is equal to the sum of digits in its prime factorization)

Enter Lower Range:1
Enter Upper Range:100
Smith numbers between 1 and 100:
4 22 27 58 85 94

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Code

import java.util.Scanner;
public class SmithNumberInGivenRange
{

    public static void main()
    {
        int upperRange=0,lowerRange=0;
        int sumd=0,sump=0,i=0,j=0,k=0,temp=0,temp1=0,flag=0;
        Scanner sc=new Scanner(System.in);
        System.out.print("Enter Lower Range:");
        lowerRange=sc.nextInt();
        System.out.print("Enter Upper Range:");
        upperRange=sc.nextInt();
        System.out.println("Smith numbers between "+lowerRange+" and "+upperRange+":");
        for(i=lowerRange;i<=upperRange;i++)
        {
            temp=i;
            while(temp>0)
            {
                sumd=sumd+(temp%10);
                temp=temp/10;
            }
            temp=i;
            for(j=2;j< i;j++)
            {
                while(temp%j==0)
                {

                    flag=0;
                    //checking whether number is prime number or not
                    for(k=2;k< j;k++)
                    {

                        if(j%k==0)
                        {
                            flag=1;
                            break;
                        }
                    }
                    //if number is prime then only it is added to sump
                    if(flag==0)
                    {
                        temp1=j;
                        //Extracting digits if i >9 and then adding extracted digits to sump
                        while(temp1>0)
                        {
                            sump=sump+(temp1%10);
                            temp1=temp1/10;
                        }
                        temp=temp/j;

                    }

                }
            }

            if(sumd==sump && i>0)
            {
                System.out.print(i+" ");
            }
            sumd=0;
            sump=0;
        }

    }
}