Program to find factorial of the number

0 Suresh Chand March 28, 2021

In this example, we will learn to find the factorial of any number using C++ programming language.\

To understand this example, You must knowledge in following topics.

As we know, Factorial is the multiplication of numbers from 1 to that number. The value of factorial of any number must be greater than 1.

Lets look and example to make clear concepts

6! = 6 X 5 X 4 X 3 X 2 X 1 = 720

In this example, We will do the same action. We will run a for-loop from 1 to that number and multiply each number and store it in one variable. Later we will print that variable.

#include <iostream>
using namespace std;

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

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

    if (n < 0)
        cout << "The factorial of negative number doesn't exists.";
    else {
        for(int i = 1; i <=n; ++i) {
            factorial *= i;
        }
        cout << "Factorial of " << n << " = " << factorial;    
    }

    return 0;
}

The output of above program is

Enter a positive integer: 6
Factorial of 6 = 720

Enter a positive integer: -2
The factorial of negative number doesn't exists.

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