## Java Program:

- To print factorial of a number

#### Example:

User Input: 5

Output:
Factorial of 5 : 120

``````import java.util.Scanner;
public class Factorial {
public static void main(String []args) {
int num;
long fact=1;
Scanner userInput = new Scanner(System.in);
num = userInput.nextInt();

System.out.print("Factorial of "+num+" : ");
for(int i=1; i<=num; i++)
fact*=i;
System.out.print(fact);
}
}``````

### Output:

```  Enter your number : 3
Factorial of 3 : 6
```
Program
number

You should know first :

`Factorial of N : 1*2*3*4.....*NFactorial of 0 : 1`

The variable which holds factorial value (above `fact`) must be of type long

Because,
long : Factorial of a number can be very large [ valid for upto 20! ]

``````for(int i=1; i<=num; i++)
fact*=i;``````

For greater than 20! , you have to use BigInteger of Math library

Must import java.math.BigInteger in this case

``````for(int i=1; i<=num; i++)
fact = fact.multiply(BigInteger.valueOf(i));``````
Concept

Coming Soon !

Quick
Tutorial

# Quote

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