Answer to Question #283746 in C++ for Collay

Question

2. Factorials

by CodeChum Admin

For those of you who may not now, a factorial is a product of multiplying from 1 until the number. Now, you must make a program that will accept an integer and then print out its factorial using loops.

Are you up for this task?

Instructions:

1. Input a random positive integer.
2. Using a for() loop, generate the factorial value of the integer and print out the result.Tip: Factorials work like this: Factorial of 5 = 1*2*3*4*5
3. Note that there is a special case and that is the factorial of 0 which is 1.

Input

A line containing an integer.

5

Output

A line containing an integer.

120

Answer 1

#include <iostream>
using namespace std;


int main() {
	int n;
	long double factorial = 1.0;




	cin >> n;


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




	cin>>n;
	return 0;
}