Write a program to find the factorial value of any number

The program first imports the java.util.Scanner package to allow user input. It then declares a class called Factorial and a main method, which is the entry point of the program.

Within the main method, the program prompts the user to enter a number for which they want to calculate the factorial and stores the input in the variable num. It then initializes a variable fact to 1.

Next, the program runs a for loop from 1 to num, multiplying the value of fact by each number in the loop to calculate the factorial. For example, if num is 5, the loop will run from 1 to 5, multiplying fact by 1, then 2, then 3, and so on, until the loop ends at 5. Finally, the program prints out the calculated factorial value.

Source Code

import java.util.Scanner;
class Factorial
{
	public static void main(String[] args)
	{
		Scanner input = new Scanner(System.in);
		System.out.print("Enter Factorial Number : ");
		int num = input.nextInt();
		int fact = 1;
		for(int i=1; i<=num; i++)
		{
			fact *= i;
		}        
		System.out.println("Factorial: "+ fact);		
	}
}

Output

Enter Factorial Number : 5
Factorial: 120