#include <iostream>
using namespace std;
int main()
{
    int number, x;
    cout << "Hey dude!" << endl;
    cout << "I hope you are great and everything is okay with you" << endl;
    cout << "I am here for you ." << endl;
    cout << "please Enter a number" << endl;
    cin >> number;
    if (number >=0  && number <= 100)
        x = 1;
    else if (number > 100 && number <= 1000)
        x = 2;
    else
        x = 3;
    switch (x)
    {
    case 1:
    {
        int factorial = 1;
        for (int i = number ; i > 0 ; i--)
            factorial = factorial*i;
        cout << "the factorial is equal" << factorial << endl;
        break;
    }
    case 2:
    {
        int Prime;
        Prime = true;
        for (int i = 2; i <= number; i++)
            if (number%i ==0)
                Prime = false;
        if (Prime == false)
            cout << " Sorry The number is not Prime please try Enter another one" << endl;
        else
            cout << " Congratulations The number is Prime !" << endl;
        break;
    }
    case 3:
    {
        int sum;
        sum = 0;
        for (int i = 1; i < number; i++)
            if (number%i == 0)
                sum += i;
        if (sum == number)
            cout << " Congratulations The number is perfect !" << endl;
        else
            cout << "Sorry The number is not perfect please try Enter another one" << endl;
        break;
    }
    default:
    {

        cout << " Sorry dude there is an error " << endl;
        cout << " Maybe The number that you entered isn't integer please try again" << endl;
        break;
    }
    }
    system("pause");
}