Calling a class's constructor inside another class

Question

I have a test next week for c++ and I\'m preparing myself for it. I\'m confused when I have 2 classes as shown below. I have to walk through the execution of the code, line by l

Answer 1

x = one(a, b);  //here is my problem
y = one(c, d);  //here is my problem

What this code does is that it calls the constructor of the class one and assigns the newly created instance of this class to the variables x and y.

The constructor of class one is in line 9.

Answer 2

from the line x = one(a, b); it jumps to line one(int a, int b) and executes the parameterized constructor of one

same for line y = one(c, d);

Answer 3

Current approach works only if you have a default constructor in one class. It is better to initialize members in constructor initialization list:

two(int a, int b, int c, int d) 
    : x(a,b), y(c,d)
{
        cout << "made one two\n";
}