C++: Operator Overloading

#include<iostream>

using namespace std;

class A
{
        int a;
        public:
                A(int x=0):a(x){
                        cout<<"in Cons"<<endl;
                }
                friend A operator+(const A& _a1, const A& _a2);
                friend ostream& operator<<(ostream &out, const A& _a);
                int getData()
                {
                        return a;

                }
};

A operator+(const A& _a1, const A& _a2)
{
        cout<<"Inside operator+"<<endl;

        return  A(_a1.a + _a2.a);

}
ostream& operator<<(ostream & o, const A& _a)
{
        o << _a.a;
        return o;

}

int main()
{
        A x1(2), x2(3);
        A x3 = x1  + x2;
        cout << x3 <<",  "<<x1<<endl;

}