Java Program - Find Factorial of a Number
The factorial of a positive integer is the multiplication of all positive integer less than or equal to that number.
factorial of number n = n! = n(n-1)(n-2)...1
For Example:
5! = 5 × 4 × 3 × 2 × 1 = 120
4! = 4 × 3 × 2 × 1 = 24
Example: Using Recursive method
In the below example, a recursive method called factorial() is used to calculate factorial of a number.
public class MyClass { static int factorial(int x) { if (x == 0 || x == 1) {return 1;} else {return x*factorial(x-1);} } public static void main(String[] args) { System.out.println("10! = " + factorial(10)); System.out.println("6! = " + factorial(6)); } }
The above code will give the following output:
10! = 3628800 6! = 720
Example: Using Iterative method
The factorial of a number can also be calculated using iterative method.
public class MyClass { static int factorial(int x) { int finalnum = 1; for(int i = x; i > 0; i--) { finalnum = finalnum * i; } return finalnum; } public static void main(String[] args) { System.out.println("10! = " + factorial(10)); System.out.println("6! = " + factorial(6)); } }
The above code will give the following output:
10! = 3628800 6! = 720
Example: Using Ternary Operator
In the below example, the factorial of a number is calculated using ternary operator.
public class MyClass { static int factorial(int x) { int y = (x == 0 || x == 1)? 1 : x*factorial(x-1); return y; } public static void main(String[] args) { System.out.println("10! = " + factorial(10)); System.out.println("6! = " + factorial(6)); } }
The above code will give the following output:
10! = 3628800 6! = 720