Calculator in C++ Template

#include <iostream>
#include <iomanip>

using namespace std;

int main()
{

        // Introduction

    cout << "Welcome to calculator" << endl;

    cout << "" << endl; // Empty Space

    cout << "" << endl; // Empty Space

    cout << "Made by *enter_name*" << endl;

    cout << "" << endl; // Empty Space

    cout << "" << endl; // Empty Space

        // Calculator

    int num1; // Number 1 Variable

    int num2; // Number 2 Variable

    char opr; // Operation Variable


        // Number 1

    cout << "Enter your first number : ";
    cin >> num1;
    cout << endl;

    cout << "" << endl; // Empty Space

        // Number 2

    cout << "Enter your second number : ";
    cin >> num2;
    cout << endl;

    cout << "" << endl; // Empty Space

        // Operation

    cout << "Enter your operation ( *, -, +, / ) : ";
    cin >> opr;
    cout << endl;

    cout << "" << endl; // Empty Space

        // Fetching answers

    cout << num1 << " " << opr << " " << num2 << " = ";
    switch (opr) {
    case '+':
        cout << num1 + num2 << endl;
        break;
    case'-':
        cout << num1 - num2 << endl;
        break;
    case'*':
        cout << num1 * num2 << endl;
        break;
    case'/':
        if (num2 != 0)
            cout << num1 / num2 << endl;
        else
            cout << "ERROR \nCannot divide by zero" << endl;
        break;
    default:
        cout << "Illegal operation" << endl;
    }

        // Makes sure the Program doesn't end

    string Endless;

    cin >> Endless;

    return 0;
}