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Factorial of Large Number Using boost multiprecision Library
  • Difficulty Level : Medium
  • Last Updated : 28 Jan, 2018

We have given a large number now we can easily find out the factorial of this large number using boost multiprevision Library.
Boost library has included a new multiprecision library in the current 1.53.0 release for C++ programmers who need more precision than 64 bits.

Examples:

Input : 100
Output :  933262154439441526816992388562667004-
         907159682643816214685929638952175999-
         932299156089414639761565182862536979-
         208272237582511852109168640000000000-
         00000000000000



Input :50
Output : 3041409320171337804361260816606476884-
         4377641568960512000000000000




// CPP program to find factorial of large 
// number using boost library.
#include <bits/stdc++.h>
#include <boost/multiprecision/cpp_int.hpp>
using boost::multiprecision::cpp_int;
using namespace std;
  
cpp_int Factorial(int number)
{
    cpp_int num = 1;
    for (int i = 1; i <= number; i++)
        num = num * i;
    return num;
}
  
int main()
{
    int number = 100;
    cpp_int fact = Factorial(number);
    cout << fact << endl;
    return 0;
}

Output:-

933262154439441526816992388562667004-
         907159682643816214685929638952175999-
         932299156089414639761565182862536979-
         208272237582511852109168640000000000-
         00000000000000
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