Functions..

Question

The built-in or predefined function for finding the factorial of a number is...

Answer 1

The factorial of a number is the product of all the Integers (int) from 1 to that number.!

Examp:

#include<iostream>
using namespace std;

int factorial(int n);

int main()
{
int n;

cout << "Enter a positive integer: ";
cin >> n;

cout << "Factorial of " << n << " = " << factorial(n);

return 0;
}

int factorial(int n)
{
if(n > 1)
return n * factorial(n - 1);
else
return 1;
}

----------------------------
Output :

Enter an positive integer: 6
Factorial of 6 = 720