1
h02
CS24 W19
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h02: Chapter 2.3-2.5

ready? assigned due points
true Wed 01/16 02:00PM Mon 01/28 09:00AM

You may collaborate on this homework with AT MOST one person, an optional "homework buddy".

MAY ONLY BE TURNED IN IN THE LECTURE/LAB LISTED ABOVE AS THE DUE DATE,
OR IF APPLICABLE, SUBMITTED ON GRADESCOPE. There is NO MAKEUP for missed assignments;
in place of that, we drop the lowest scores (if you have zeros, those are the lowest scores.)

Please:

  • No Staples.
  • No Paperclips.
  • No folded down corners.

Complete your reading of Chapter 2, section 2.3 - 2.5 (If you don’t have a copy of the textbook yet, there is one on reserve at the library under “COMP000-STAFF - Permanent Reserve”).

    1. (10 pts) What is the purpose of namespaces in C++ programs?
    2. (30 pts) Consider the point class defined and implemented on pages 64 and 65. Then, answer the following questions:
    a. Name all the special class methods that are used to initialize an object of the class at the time that it is created.
    b. What is the output of the following code? Assume the code is embedded in a correct C++ program. 
    point p1, p2(20.0), p3(50,60);
cout<<p1.get_x()<<" "<<p1.get_y()<<endl;
cout<<p2.get_x()<<" "<<p2.get_y()<<endl;
cout<<p3.get_x()<<" "<<p3.get_y()<<endl;
p1 = p3;
p1.rotate90();
cout<<p1.get_x()<<" "<<p1.get_y()<<endl;
    c. Is the copy constructor called in the above code? If so, where?
    3. (10 pts) On page 72, why are the parameters of the distance() function of type const reference?
    4. (20 pts) For the point class on page 64 and 65, implement the overloaded parameter '*', so that the operator can be used to scale the x and y values of a point by a fixed number. Usage: point p2 = 2.0*p1; In this example p2's x and y coorinates should be double that of p1. Specify whether you would implement the operator as a member function, a non-member function or a friend function, and why?
    5. (30 pts) For the point class on page 64 and 65, implement the overloaded parameter '+=', so that for two point objects p1 and p2, p1+=p2, produces the effect of adding p2's x and y member variables to the corresponding member variables of p1, and store the resulting values back into p1. Usage: p1+=p2; Specify whether you would implement the operator as a member function, a non-member function or a friend function, and why?