# Calculate factorial of a number.

How to calculate factorial of a given number? May 23, 2012 at 6:00 PM

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

public class Factorial {
public static void main(String args[]) throws IOException {
int num = 0;
num = Integer.parseInt(data);
int result = num;
for (int i = 1; i < num; i++) {
result = result*i;
}
System.out.println(result);
} }
```

Description: - Factorial of any number n is represented by !n and is equal to n(n-1)(n-2)(n-3)?.1. BufferReader () is used for user input.BufferReader consider inputted value as String so for int value you have to use Integer.parseInt(). For loop from 1 to num-1 calculating the factorial value of num as result=result*i. Initial value of result is num. May 25, 2012 at 12:23 AM

Explanation : Java supports recursion. Recursion is the process of defining something in terms of itself. As it relates to java programming, recursion is the attribute that allows a method to call itself. A method that calls itself is said to be recursive.

The classic example of recursion is the computation of the factorial of a number. The factorial of a number N is the product of all the whole numbers between 1 and N. for example, 3 factorial is 1�?2�?3, or 6. Here is how a factorial can be computed by use of a recursive method

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