factorial in c++
#include<bits/stdc++.h>
#include<stdio.h>
using namespace std;
int fact(int i){
if (i <= 1) return 1;
else return i*fact(i-1);
}
int main(){
ios::sync_with_stdio(0);
cin.tie(0);
int N;
cin >> N;
cout << fact(N) << "\n";
return 0;
}factorial c++ without using function
#include <iostream>
using namespace std;
int main()
{
unsigned int num; //unsigned is used for not taking negetive values.
unsigned long long factorial = 1; //Since the factorial a number can be large, so long long data type is used.
cout << "Give me any positive number : ";
cin >> num;
for (int i = 1; i <= num; i++) {
factorial = factorial * i;
}
cout << "Factorial of the given number is: " << factorial;
}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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