Navigating C++ and Object-Oriented Design

12.7. Exercises

1:

In the tax() function on page 566, implement the isA() function for the Investment class hierarchy.

2:

Study the following program and its output. // fig.C - Circles and Squares with Figure base class #include <iostream.h> #include "Figure.h" int main() { Circle c1(4); // define Circle Square s1(8); // define Square Circle c2(6); // define Circle Square s2(12); // define Square c1 += c2; // make Circle c1 bigger c1 += s2; // error s1 += s2; // make Square s1 bigger s1 += c2; // error cout << "c1 = " << c1 << endl; cout << "s1 = " << s1 << endl; return 0; } $ fig Circle: right operand should be a Circle Square: right operand should be a Square c1 = 314.159 for a Circle s1 = 400 for a Square The program overloads operator+=() ...