[C++][4] Basic calculator with user input

#include <iostream> //pre-processor directive

using namespace std; //std library

int main() //it starts with the main 1st
{
    int a; //variable a
    int b; //variable b

    int sum;


    cout << "Enter a number dude~ \n";
    cin >> a; //cin-input stream object >>-stream extraction operator

    cout << "enter another number \n";
    cin >> b;

    sum = a+ b;
    cout << "the sum of numbers is " << sum << endl;

    return 0; //to tell that program ran fine
}