Return pointer value errors

[Ahmed Abdellatif]

the value of x and y in the returning pointers is not as expected. X value is right but y value is wrong.

#include <iostream>
using namespace std;
struct point
{
    void setPointValue();
    void print();
    double x,y;
};
point* add_2d_points(point*,point*);
int main()
{
    point p1,p2,p_additive;
    point *p1_ptr,*p_additive_ptr;

    p1_ptr=&p1;
    p1_ptr->setPointValue();

    point *p2_ptr=&p2;
    p2_ptr->setPointValue();

    p1_ptr->print();
    p2_ptr->print();

    p_additive_ptr=add_2d_points(p1_ptr,p2_ptr);
    p_additive_ptr->print();              //the problem appears here
    return 0;
}
point* add_2d_points(point* a,point* b)
{
    point p;
    point*p_ptr=&p;
    p_ptr->x=a->x+b->x;
    p_ptr->y=a->y+b->y;
    return p_ptr;
}

void point::setPointValue()
{
    cout<<"Entre value of x\n";
    cin>>x;
    cout<<"Entre value of y\n";
    cin>>y;
}

void point::print()
{
    cout<<"x = "<<x<<endl;
    cout<<"y = "<<y<<endl;
}

[AbstractionAnon]

Line 30: p is a local variable. it goes out of scope when add_2d_points exits.
Line 34: p_ptr points to something that no longer exists.

[Ahmed Abdellatif]

thanks