factorial using recursion in c++
#include <iostream>
using namespace std;
int factorial(int n)
{
if (n < 0)
return (-1); /*Wrong value*/
if (n == 0)
return (1); /*Wrong value*/
else
{
return (n * factorial(n - 1));
}
}
int main()
{
int number, ans;
cin >> number;
ans = factorial(number);
cout << ans;
return 0;
}c++ factorial
#include <cmath>
int fact(int n){
return std::tgamma(n + 1);
}
// for n = 5 -> 5 * 4 * 3 * 2 = 120
//tgamma performas factorial with n - 1 -> hence we use n + 1Copyright © 2021 Codeinu
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