Strong Number Program in Java Example

If sum of factorial of each digit of the number is same as the actual number then that number is called as strong number.

Algorithm for Strong Number:

Here the method has one formal argument b and it returns an integer value to its caller.

step 1: Set fact= 1

step 2: Read b

step 3: Set c=b

step 4: Repeat through step-6 until (c > 0)

step 5: fact=fact*c

step 6: c=c-1

step 7: return fact

step 8: Exit

Here is the Java Example for Strong Number:

import java.util.Scanner; 
 public class StrongNumber 
 { 
                public static void main(String args[]) 
               { 
                  StrongNumber ss=new StrongNumber(); 
                  int a,b,r,s=0; 
                  Scanner sl=new Scanner(System.in); 
                  System.out.println("Enter A Number"); 
                  b=sl. nextInt() ; 
                  a=b; 
                  while(b>0) 
                        { 
                            r=b%10; 
                            s=s+ss.fact(r); 
                            b=b/10; 
                        } 
                   if(a==s) 
                      System.out.println(a+" is a strong number"); 
                   else 
                      System.out.println(a+" is not a strong number"); 
                 } 
                        int fact(int i) 
                              { 
                                  int f,j; 
                                  f=1; 
                                 for(j=i ;j>0;j--) 
                                      f=f*j; 
                                      return f; 
                               } 
 }