Question

How to calculate factorial of a number using recursion in C++

Answer 1

#include <iostream>

using namespace std;

long recursiveFactorial(int n);

int main()
{
	int n = 5;
	
	cout << "factorial of " << n << " is: " << recursiveFactorial(n) << endl;

	return 0;
}
long recursiveFactorial(int n)
{
	if (n == 0)
		return 1;
	else
		return(n * recursiveFactorial(n - 1));
}

/*
run:

factorial of 5 is: 120

*/

 

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Answer 2

#include <iostream>

using namespace std;

class calculation
{
	public:
		long recursiveFactorial(int n)
		{
			if (n == 0)
				return 1;
			else
				return(n * recursiveFactorial(n - 1));
		}
};

int main()
{
	calculation c;
	int n = 5;
	
	cout << "factorial of " << n << " is: " << c.recursiveFactorial(n) << endl;

	return 0;
}


/*
run:

factorial of 5 is: 120

*/

 

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