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fectorial of large number

Inquisitive Iguana answered on August 4, 2022 Popularity 1/10 Helpfulness 8/10

answer fectorial of large number

fectorial of large number

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// C++ program to compute factorial of big numbers
#include<iostream>
using namespace std;
 
// Maximum number of digits in output
#define MAX 500
 
int multiply(int x, int res[], int res_size);
 
// This function finds factorial of large numbers
// and prints them
void factorial(int n)
{
    int res[MAX];
 
    // Initialize result
    res[0] = 1;
    int res_size = 1;
 
    // Apply simple factorial formula n! = 1 * 2 * 3 * 4...*n
    for (int x=2; x<=n; x++)
        res_size = multiply(x, res, res_size);
 
    cout << "Factorial of given number is \n";
    for (int i=res_size-1; i>=0; i--)
        cout << res[i];
}
 
// This function multiplies x with the number
// represented by res[].
// res_size is size of res[] or number of digits in the
// number represented by res[]. This function uses simple
// school mathematics for multiplication.
// This function may value of res_size and returns the
// new value of res_size
int multiply(int x, int res[], int res_size)
{
    int carry = 0;  // Initialize carry
 
    // One by one multiply n with individual digits of res[]
    for (int i=0; i<res_size; i++)
    {
        int prod = res[i] * x + carry;
 
        // Store last digit of 'prod' in res[] 
        res[i] = prod % 10; 
 
        // Put rest in carry
        carry  = prod/10;   
    }
 
    // Put carry in res and increase result size
    while (carry)
    {
        res[res_size] = carry%10;
        carry = carry/10;
        res_size++;
    }
    return res_size;
}
 
// Driver program
int main()
{
    factorial(100);
    return 0;
}

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Source: www.geeksforgeeks.org

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Contributed on Aug 04 2022

Inquisitive Iguana

0 Answers Avg Quality 2/10

fectorial of large number

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