Check Strong Number
Check whether a number is a strong number (sum of factorials of digits equals the number).
IntermediateTopic: Module 2: Conditional Programs
Java Check Strong Number Program
This program helps you to learn the fundamental structure and syntax of Java programming.
import java.util.Scanner;
public class Main {
private static int factorial(int n) {
int fact = 1;
for (int i = 2; i <= n; i++) {
fact *= i;
}
return fact;
}
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
System.out.print("Enter a number: ");
int n = sc.nextInt();
int temp = n;
int sum = 0;
while (temp != 0) {
int d = temp % 10;
sum += factorial(d);
temp /= 10;
}
if (sum == n) {
System.out.println(n + " is a Strong Number");
} else {
System.out.println(n + " is not a Strong Number");
}
sc.close();
}
}Output
Enter a number: 145 145 is a Strong Number
Understanding Check Strong Number
We compute factorial of each digit and add them; if the sum equals the original number, it is strong.
Note: To write and run Java programs, you need to set up the local environment on your computer. Refer to the complete article Setting up Java Development Environment. If you do not want to set up the local environment on your computer, you can also use online IDE to write and run your Java programs.