In this section you will learn how to find the factorial of a number.

Java Factorial Program Using Recursion

In this section you will learn how to find the factorial of a number.

Here I am giving a simple example which is concern for finding the factorial of a number. In mathematics factorial is defined as n! = n*(n-1)...2*1.  where, n is a natural number and n ≥ 1. Value of 0! is 1. for example 5! = 5*4*3*2*1.

Factorial.java

```import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.IOException;

class Factorial
{
long fact(long a)
{
if(a <= 1)
return 1;
else
{
a= a*fact(a-1);
return a;
}
}
public static void main (String arr[]) throws IOException
{
System.out.println("Enter a number to find factorial");
BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
int num = Integer.parseInt( br.readLine());
Factorial f = new Factorial();
System.out.println(f.fact(num));
}
}```

Output :

When you will execute the above example you will get the output as :

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