Factorial of a given number – Algorithm, Flowchart, and Program

What is the factorial of a number?

Factorial is a product of all positive integers less than or equal to a given number n. Factorial is denoted by a symbol (!).  In simple language, factorial is multiplying the whole numbers until 1.

for example,

Factorial of 5! = 5x4x3x2x1 = 120

In this way, we can calculate the factorial of any positive integer number.

In programming, you have to write an algorithm and program to calculate the factorial of a given number. It is one of the primary programs asked during the interview to check your logic-building skills.

Below I have given a flowchart, algorithm, and program to calculate the factorial of a given number.

Also Read: Check if number is Palindrome – Algorithm, Flowchart and Program

Flowchart for finding factorial of a given number

Algorithm for finding factorial of a given number

Step 1: Start

Step 2: Read the input number from the user

Step 2: Declare and initialize variables fact = 1 and i =  1

Step 4:  Repeat the loop until  i<=num

–  fact = fact * i

–  i =  i++

Step 5:  Print fact to get the factorial of a given number

Step 6: Stop

Also Read: Bubble sort algorithm in java

Factorial of a given number in Java

import java.util.Scanner;

class Factorial {

	public static void main(String[] args){
	
	Scanner sc = new Scanner(System.in);
		System.out.println("Enter Number: ");
		int num = sc.nextInt();
		
		int fact = 1;
		
		for(int i=1; i<=num; i++){
		
			fact = fact * i;
			
		}
		
		System.out.println("Factorial of a given number is " + fact);
		
		}
		
	}