Write a program to print factorial of any number using do while loop

import java.util.*;
class factorial
{
public static void main (String arg[])
{
Scanner in = new Scanner (System.in);

int a,b=1;
System.out.print ("\n\t Enter the number = ");
a=in.nextInt();

do
{
b*=a;
--a;
}while (a>0);

System.out.println ("\n\t Factorial = "+b);

}
}

Note:
        In this program first of all body of the loop will be executed then its condition will be checked if it is true then body of the loop will be executed again otherwise not. This will continue until a=0. When a=0 the loop will be broken and the next statement to it will be executed.