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Classes

#include <iostream>
using namespace std;
class Point {
private:
// fields are accessible only to methods belonging to point
double x;
double y;
public:
void set_x(double a_x) {
this->x = a_x; // set the member x to the value a_x
}
void set_y(double a_y) {
this->y = a_y;
}
// get value of x, const implies that the method does not
// modify the object
double get_x() const {
return x;
}
// get value of y, const implies that the method does not
// modify the object
double get_y() const {
return y;
}
// negate x and y (method implemented outside class body)
void reflect();
};
void Point::reflect() {
x = -x; // alternatively, this->x = - this->x
y = -y; // alternatively, this->y = - this->y
}
int main() {
Point p;
p.set_x(1);
p.set_y(2);
cout << '(' << p.get_x() << ',' << p.get_y() << ')' << endl;
p.reflect();
cout << '(' << p.get_x() << ',' << p.get_y() << ')' << endl;
return 0;
}
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