Factorial of a non-negative integer, is multiplication of all integers smaller than or equal to n. For example factorial of 6 is 6*5*4*3*2*1 which is 720.
Recursive :
// Java program to find factorial of given number class Test { // method to find factorial of given number static int factorial(int n) { if (n == 0) return 1; return n*factorial(n-1); } // Driver method public static void main(String[] args) { int num = 5; System.out.println("Factorial of "+ num + " is " + factorial(5)); } } |
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Iterative Solution:
// Java program to find factorial of given number class Test { // Method to find factorial of given number static int factorial(int n) { int res = 1, i; for (i=2; i<=n; i++) res *= i; return res; } // Driver method public static void main(String[] args) { int num = 5; System.out.println("Factorial of "+ num + " is " + factorial(5)); } } |
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One line Solution (Using Ternary operator):
// Java program to find factorial // of given number class Factorial { int factorial(int n) { // single line to find factorial return (n == 1 || n == 0) ? 1 : n * factorial(n - 1); } // Driver Code public static void main(String args[]) { Factorial obj = new Factorial(); int num = 5; System.out.println("Factorial of " + num + " is " + obj.factorial(num)); } } // This code is contributed by Anshika Goyal. |
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The above solutions cause overflow for small numbers. Please refer factorial of large number for a solution that works for large numbers.
Please refer complete article on Program for factorial of a number for more details!
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