**Factorial**of a number is the product of all positive descending integers. Factorial of n is denoted by n!.

```
For example,
3! = 3 * 2 * 1 = 6
4! = 4 * 3 * 2 * 1 = 24
5! = 5 * 4 * 3 * 2 * 1 = 120
```

Here you have to get the number from command line argument. The logic to find the factorial of a number is given below.

**PROGRAM**

class Factorial { public static void main(String[] args) { int fact=1,no; no = Integer.parseInt(args[0]); System.out.print("Factorial of "+no+" is "); while(no > 0) { fact = fact * no; no--; } System.out.println(fact); } }

**OUTPUT**

C:\>javac Factorial.java C:\>java Factorial 4 Factorial of 4 is 24

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