function factorial program in cpp code example

Example 1: 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;
}

Example 2: program to calculate factorial of number in c++

#include <iostream>
using namespace std;

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

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

    for(int i = 1; i <=n; ++i)
    {
        factorial *= i;
    }

    cout << "Factorial of " << n << " = " << factorial;    
    return 0;
}

Example 3: 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;
}