Factorial of any number is n!.For example,Factorial of 5 is 5*4*3*2*1=120.We can solve the problem either using for loop or recursion.

**Input Parameters:-**5

**Output:-**120

**Sample Program:-**

```
/**
* @author Dixit
*
*/
public class FactorialProgram {
/**
* @param args
*/
public static void main(String[] args) {
int number = 4;
/*
* Factorial of any number is! n. For example, factorial of 4 is
* 4*3*2*1.
*/
int fact;
fact = factorial(number);
System.out.println("Factorial of a number :" + fact);
fact = factorialUsingRecursion(number);
System.out.println("Factorial of a number using recursion:" + fact);
}
private static int factorialUsingRecursion(int number) {
if (number <= 1)
// if the number is 1 then return 1
return 1;
else
// else call the same function with the value - 1
return number * factorialUsingRecursion(number - 1);
}
private static int factorial(int number) {
int factorial = number;
for (int i = (number - 1); i > 1; i--) {
factorial = factorial * i;
}
return factorial;
}
}
```

```
Output
Factorial of a number :24
Factorial of a number using recursion:24
```

**Enjoy Programming**

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