Factorial in Java

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Q. Write a Java program for Factorial Number

import java.util.Scanner;

public class FactorialNumber {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);

        // Ask user to enter a number
        System.out.print("Enter a non-negative integer: ");
        int number = scanner.nextInt();

        long factorial = 1;

        // Check if number is negative
        if (number < 0) {
            System.out.println("Factorial is not defined for negative numbers.");
        } else {
            // Loop to calculate factorial
            for (int i = 1; i <= number; i++) {
                factorial *= i;
            }
            System.out.println("Factorial of " + number + " is: " + factorial);
        }

        scanner.close();
    }
}
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Q. Write an algorithm for Factorial Number

 1. Start
2. Read an integer and store it in number
3. If number < 0, print "Factorial not defined" and stop
4. Initialize factorial = 1
5. Repeat from i = 1 to number:
    a. Multiply factorial = factorial * i
6. Print factorial
7. End
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