To find the FACTORIAL of any integer number

Question - 

Given any Integer number, you have to find the factorial of that number.

Example - 

Input : num = 5

Output : Factorial of 5 is : 120

Approach - 

as we know the formula of factorial. 

n!=1*2*3*.......*(n-1)

Implementation - 

// to find factorial of any integer number

#include<iostream>

using namespace std;

int factorial(int num)

{

    int fact=1;

    for(int i=1;i<=num;i++){

        fact*=i;

    }

    return fact;

    

}

int main()

{

    int num;

    cout<<"Enter the number : ";cin>>num;

    int fact=factorial(num);

    cout<<"Factorial of "<<num<<" is : "<<fact<<endl;

    return 0;

}

code on compiler

Time complixity - O(n)