Calculator - C++ operator-overloading

I am new to object-oriented concepts. The following is my attempt at creating a basic calculator using class and operator overloading concepts. Please review it for improvements. Also, how do I make it more intuitive? I want to display: +,-,*,/ as options and use switch on them.

#include 
#include 

using namespace std;

class calculator
{
    private:
        float val;

    public:
        calculator(): val(0)
        {}

        void getdata()
        {           
            cout > val;
        }

        void showdata()
        {
            cout > choice;
    cout << endl;

    switch (choice)
    {
        case 1:
            obj3 = obj1 + obj2;
            break;
        case 2:
            obj3 = obj1 - obj2;
            break;
        case 3:
            obj3 = obj1 * obj2;
            break;
        case 4:
            obj3 = obj1 / obj2;
            break;
        default:
            cout << "Invalid choice! " << endl;
    }

    cout << "Result ";
    obj3.showdata();
    cout << endl;

}

You can also overload operator>> instead of using getdata():

std::istream& operator>>(std::istream& in, calculator& obj)
{
    return in >> obj.val;
}

Similar approach with showdata(), using operator



• You don't appear to be using , so just remove it.






• You don't need to use std::endl in so many places. A simple "\n"` for outputting a newline should be sufficient. More info about that here.

StackExchange Code Review Q#79185, answer score: 5