How to print two coordinates from class? - c++

Question

I have been trying to print the points like The position of the point is (1,2) from using class, but I can't figure out a way to do it. I simply can't find a way to return two numbers like that, but the problem requires solution that way.
#include <iostream>
using namespace std;
class MyPoint{
public:
int x,y,radius;
MyPoint()
{
x=0;
y=0;
}
MyPoint(int x1,int y1)
{
x=x1;
y=y1;
}
int point_display()
{
char st=(x,y);
return st;
}
int getAdd()
{
return x+y;
}
};
int main()
{
MyPoint mypoint;
cin>>mypoint.x>>mypoint.y;
cout<<"The position of the point is "<<mypoint.point_display()<<endl;
cout<<"The sum of the coordinates is "<<mypoint.getAdd()<<endl;
return 0;
}

Answer 1

The usual solution to this is to provide an overload of operator << for class MyPoint to print the point.
Something like this:
#include <iostream>
using namespace std;
class MyPoint{
public:
int x,y,radius;
MyPoint()
{
x=0;
y=0;
}
MyPoint(int x1,int y1)
{
x=x1;
y=y1;
}
int getAdd()
{
return x+y;
}
friend ostream& operator << (ostream& os, const MyPoint& p);
};
ostream& operator << (ostream& os, const MyPoint& p)
{
os << p.x << ", " << p.y;
return os;
}
int main()
{
MyPoint mypoint { 1,2 };
cout<<"The position of the point is "<<mypoint<<endl;
cout<<"The sum of the coordinates is "<<mypoint.getAdd()<<endl;
return 0;
}
Output:
The position of the point is 1, 2
The sum of the coordinates is 3
Live demo

Answer 2

Your point_display could return a string composed of the 2 values:
std::string point_display()
{
return std::string{"("} + std::to_string(x)
+ "," + std::to_string(x) + ")";
}
Alternatively, as your question asks about returning 2 values, the function could return a pair:
std::pair<int,int> point_display ()
{
return {x,y};
}
and in main, you could do:
auto [x, y] = mypoint.point_display();
cout << "The position of the point is ("
<< x << "," << y << ")" << endl;
However, since the data members are public, you could just destructure the object and print out the values in main:
auto [x, y, radius] = mypoint;
cout << "The position of the point is ("
<< x << "," << y << ")" << endl;

Answer 3

If all you want to do is print the coordinates, you could have the method do it:
void point_display()
{
cout << "(" << x << ", " << y << ")";
}
...
cout<<"The position of the point is ";
mypoint.point_display();
cout << endl;
If you really want to return the coordinates, you could have separate accessors ("getters"):
int getX()
{
return x;
}
int getY()
{
return y;
}
or use references:
void getCoordinates(int &rx, int &ry)
{
rx = x;
ry = y;
}
...
int a, b;
mypoint.getCoordinates(a, b);
cout << a << " " << b << endl;