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A friend offers to play one of two betting games with you. Game A is that you toss a coin twice. He pays you $10 if you get two heads. You pay him $2 for each tail you toss. Game B is that you also toss a coin twice, but it costs you $2 to play and he pays you $10 if you get two heads. Which game should you play The risk decision tree is shown in Fig. 6-1. Both games total to $0.50. Thus, each time you play, your average gain is 50 cents. No matter which game you choose.

8.40 Modify the Date class (Problem 8.39) using the number of days elapsed since the date January 1, 1 A.D. as the only data member. Include a function advance ( int d) to advance the existingdateby d days,andafunction daysElapsedSince(int y, int m, int d) that

( ) that returns an integer in the range 0 to 6 for Sunday through Saturday. Use Zeller s Algorithm:

if (month < 3) { mp = 0; yp = year - 1; } else { mp = int(0.4*month + 2.3); yp = year; } t = int(yp/4) - int(yp/lOO) + int(yp/400); return (365*year + 31*(month - 1) + day + t - mp) % 7;

Modify the Person class (Problem 8.21) to include the following member functions:

1 heads _

int isLiving(); int age(int year);

The isLiving ( > function returns 0 or 1 according to whether yod - is zero. The age ( ) function returns the persons current age based upon the current year passed to it, or it returns the person s age at death if yod- is not zero.

Implement an Employee class by modifying the Person class (Problem 8.21). Include data members for Social Security Number number, monthly salary, and tax rate. Include a member function tax ( > that returns the amount of tax paid. Implement a Student class by modifying the Person class (Problem 8.21). Include data members for student identification number, major program, grade point average, and credits earned. Include a member function update ( in t credi t , char grade) that processes the given information (credit and grade) for one course, using it to update the student s grade point average, and credits earned. Implement an Addres s class for storing a residential address. Modify the Person class (Problem 8.21) by adding an addres s data member with type Address class (Problem 8.45). Modify the Person class (Problem 8.21) replacing the declarations int yob-, yod - with:

Date dab-, dad-;

1 heads _

8.45 8.46

for date of birth and date of death (see Problem 8.38).

Implement a Computer class with data members for the computer type (e.g., I PC II), the CPU ( e.g ., I Intel Pentium"), the operating system (e.g., I DOS I), the number of megabytes of memory (e.g., 8 > , the number of gigabytes of disk space (e.g., 1.2 > , the type of printer that it has, whether it has a CD-ROM, whether it has Internet access, its purchase price, and year of purchase. Include a default constructor, a destructor, access functions, and a print ( ) function. Implement the Rat ional class with its den member declared to be unsigned instead of int. This allows for more than twice as many objects because unsigned allows more than twice as many possible positive integer values as does int. Implement the following additional member functions for the Rat ional class:

A listing declaration includes the names of the attributes, their values and defaults (if applicable), and whether the attribute is required or optional attribute type The value that speci es whether an attribute is a string, tokenized, or enumerated attribute attribute value A list of all the possible values available for an attribute axis The rst section of each location path step in XPath, which speci es the correlation between a context node and the nodes chosen by the step bidirectional link An XLink convention that allows a hyperlink to be navigated in more than one direction box properties A group of Cascading Style Sheets (CSS) properties and values for an element that governs the element s margins, padding, height, width, and border aspects.

Rational plus(Rationa1); Rational minus(Rationa1); Rational' times(Rationa1); Rational dividedBy(Rationa1);

Fig. 6-1

So, for example, the call x. minus (y) would subtract the Rat ional object y from the Rat ional object x. Note that this simulates the operator - = for the Rat ional class.