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# C/C++ Source Codes

method is allowed to change the variables of the instance it is acting upon

//A method is allowed to change the variables of the instance it is acting upon :
#include <iostream.h>
class vector
{
public:
double x;
double y;
vector its_oposite()
{
vector r;
r.x = -x;
r.y = -y;
return r;
}
void be_oposited()
{
x = -x;
y = -y;
}
void be_calculated (double a, double b, double c, double d)
{
x = a - c;
y = b - d;
}

vector operator * (double a)
{
vector r;
r.x = x * a;
r.y = y * a;
return r;
}
};
void main (void)
{
vector a, b;
a.x = 3;
b.y = 5;
b = a.its_oposite();
cout << "Vector a : " << a.x << ", " << a.y << endl;
cout << "Vector b : " << b.x << ", " << b.y << endl;
b.be_oposited();
cout << "Vector b : " << b.x << ", " << b.y << endl;
a.be_calculated (7, 8, 3, 2);
cout << "Vector a : " << a.x << ", " << a.y << endl;
a = b * 2;
cout << "Vector a : " << a.x << ", " << a.y << endl;
a = b.its_oposite() * 2;
cout << "Vector a : " << a.x << ", " << a.y << endl;

cout << "x of oposite of a : " << a.its_oposite().x << endl;
}

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