1
h02
CS24 S17
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h02: Chapter 2.3-2.5

ready? assigned due points
true Wed 04/12 05:00PM Wed 04/19 05:00PM

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 three lowest scores (if you have zeros, those are the three 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. (2 pts) Why should you use namespaces in your C++ programs?
    2. (6 pts) Consider the point class defined and implemented on pages 64 and 65. Then, answer the following questions:
    a. Describe the value semantics of the point class.
    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 default copy constructor invoked in the above code?
    3. (2 pts) On page 72, why are the parameters of the distance() function of type const reference?
    4. (8 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. (8 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?