C++ Program to Find Factorial of a Number

In this program will learn how to find the factorial of a number using for loop. The factorial number is positive integer n is equal to 1*2*3*…n.

Factorial of negative number can not be found and factorial of 0 is 1

Example: Find Factorial of a Number

#include <iostream>
using namespace std;

int main()
{
    int n;
    long factorial = 1;

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

    for(int i = 1; i <= n; ++i)
    {
        factorial = factorial * i;
    }

    cout << "Factorial of " << n << " = " << factorial;
    return 0;
}

#include <iostream>

using namespace std;

int main()

{

int n;

long factorial = 1;

cout << "Enter a positive integer: ";

cin >> n;

for(int i = 1; i <= n; ++i)

{

factorial = factorial * i;

}

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

return 0;

}

When you run the program, the output will be following:

Enter a positive integer: 5
Factorial of 5 = 120

1 2	Enter a positive integer: 5 Factorial of 5 = 120