Write a program to input a numbers and find the Smallest and Largest Digit of this number.(2784, smallest digit -2, largest digit -8)

62)  Write a program to input a numbers and find the Smallest and Largest Digit of this number.(2784, smallest digit -2, largest digit -8)

import java.util.*;

public class Smallest_Largest_digit

{

    public static void main(String args[ ])

   {

              Scanner sc = new Scanner (System.in);

              System.out.println("Enter a number");

              int a = sc.nextInt();

              int b = 9;

              int c = 0;

              while(a>0)

              {

                  int d = a%10;

                  if(d>c)

                  {

                      c=d;

                  }

                  else if(d<b)

                  {

                      b=d;

                  }

                  a=a/10;

              }

              System.out.println("Smallest digit = "+b);

              System.out.println("Largest digit = "+c);

   }

}

Output : 

largest-and-smallest-digit-of-a-number

       Write a program to input a number and check whether it is Tech Number or not? (3025= (30+25)² = (55)² =3025 so it is tech number).