Thursday, 18 August 2016

BigInteger factorial


Problem Statement
You are given an integer N. Print the factorial of this number.
N!=N×(N−1)×(N−2)×⋯×3×2×1

Note: Factorials of N>20 can't be stored even in a 64−bit long long variable. Big integers must be used for such calculations. Languages like Java, Python, Ruby etc. can handle big integers but we need to write additional code in C/C++ to handle such large values.
We recommend solving this challenge using BigIntegers.
Input Format
Input consists of a single integer N.

Output Format
Output the factorial of N.
Sample Input

25

Sample Output

15511210043330985984000000

 PROGRAM:-
import java.io.*;
import java.util.*;
import java.text.*;
import java.math.*;
import java.util.regex.*;

public class Solution
{
      public static void main(String[] args)
     {
           Scanner scn=new Scanner(System.in);
           int n=scn.nextInt();
           BigInteger factorial= BigInteger.ONE;  
           for (int i = 2; i <= n; i++)
           {
 
                 factorial = factorial.multiply(new BigInteger(String.valueOf(i)));

            }
            System.out.println(factorial);
    }
}
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