Trouble with Class

Question

Does anyone have more resources for learning about class? Having a hard time understanding. Also I'm trying to display the distance between two points. Can someone explain what I'm doing wrong?

Answer 1

Line 17: double getX(); // <--- no arg
Line 20: double getY(); // <--- no arg
Line 29 add this: double length(); // separate private member
Line 71:
double Point::getX() { // removed arg
return (x);
}
Line 75:
double Point::getY() { // removed arg
return (y);
}
Line 88:
void Segment::displaySegment() {
cout << "Point A: ";
A.display();
cout << "Point B: ";
B.display();
cout << endl;
cout << "Length of the segment is: " << length() << endl; // <----
}
Add this at the end of the code:
double Segment::length() { // separate private member //Here is my trouble
return sqrt(pow(B.getX() - A.getX(), 2.0) + pow(B.getY() - A.getY(), 2.0)); // returning the distance between the 2 points
}
Output:
Point A: (3,4)
Point B: (5,6)
Length of the segment is: 2.82843
_________
https://code.sololearn.com/cu46FhYQiYu6#cpp

Answer 2

Because getters only `return` things which means there's no need to pass to them additional information. On the other hand, setters' sole responsibility is setting the private data members using input information through passing arguments to their parameters. So, to summarize
Setter general form:
void setterName(T param);
Getter general form:
T getterName();

Answer 3

Thank you. Can you explain why the arg is removed?