Factorial Program In Java In 2 Different Ways
In this tutorial, we are going to see how to calculate the factorial of a number in Java. Before moving on to the program, let’s first understand what is a factorial: the factorial of a number n is denoted by n! and the value of n! is: 1 * 2 * 3 *… (n-1) * n. There are two ways to find a factorial of a given number, using the for loop or recursion. Remember that the stop value must be the number entered by the user + 1.
The same logic we implemented in the programs below.
Method 1: Calculate the factorial using the for loop
public class Main { public static void main(String args[]){ int i, f = 1; //the number whose factorial we want to calculate int nbr = 3; for(i=1; i <= nbr; i++){ f = f * i; } System.out.println("Factorial of "+nbr+" is: "+f); } }
Output:
Factorial of 3 is: 6
[st_adsense]
Method 2: Calculate the factorial using recursion
public class Main{ static int fact(int n){ if (n == 0) return 1; else return(n * fact(n-1)); } public static void main(String args[]){ int i, f = 1; //the number whose factorial we want to calculate int nbr = 3; f = fact(nbr); System.out.println("Factorial of "+nbr+" is: "+f); } }
Output:
Factorial of 3 is: 6[st_adsense] MCQPractice competitive and technical Multiple Choice Questions and Answers (MCQs) with simple and logical explanations to prepare for tests and interviews.Read More
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