How to find out the factorial of a number in C++

Program to find out the Factorial of a number

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#include<iostream>

#include<conio.h>

using namespace std;

int factorial(int number);

int main()

{

       int result = 0, number = 0;

       cout << "\n\n\t\t\t__ Factorial of a Number __\n";

       cout << "\n\n  Enter the Number  -  ";

       cin >> number;

       result = factorial(number);

       cout << "\n\n\t\t    ______ Factorial of " << number << " is " << result << " ______";

       getch();

       return 0;

}

int factorial(int number)

{

       int factor_result = 1;

       while(number >= 1)

       {

              factor_result = factor_result * number;

              number--;

       }

       return factor_result;

}

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Factorial of a number is that number times 1 less than the factorial of that number. For Example -  Factorial of 10 is = 10 X 9!, where 9! will be 9 X 8! and so one until it reaches 1. The factorial of 1 is 1.