CSCI 270 Preliminary Quiz ( 7 Jun ) Name _________________________

Fall 2004

Given this partial class:

class Course

{

public:

int getCreditHours();

float getLabFee();

// other function prototypes will go here

private:

string dept; // department offering the course, like CSci

int number; // course number, like 270

int creditHours; // # of credit hours a student earns, like 3

bool semOffered[8]; // semesters this course is usually offered where

// subscript 1 = spring, 3 = summerI, 4 = summerII, 7 = fall

float labFee; // amount charged for a lab fee, like 25.00

}

1. What would be the name of a constructor function for this class? _____________________

A constructor function always has the same name as the class:

Course(); // default constructor for this class

Course(int number, int creditHours, float labFee);

Also constructors have no type. A constructor is neither a value-returning function nor a void function.

2. A client program using this class could legally use this declaration:

int dept; yes no

Yes, a client program may declare variables which have the same names as private variables in a class included by the program. Since the private variables are not directly accessible by the client program, there is no conflict. In fact, even if dept was a public variable of the Course class there would still be no conflict as class variables are part of and accessed through instances of the Course objects.

3. Show how a client would declare an array of 10 Course variables.

Course courses[10];

4. Write the implementation for a class function (as it would appear in the class implementation file) which will take an integer parameter 1-8 and return true if the course is usually offered in that semester or false if it is not, of if the parameter is not a valid semester.

bool Course::isOffered(int semester)

{

return semOffered[semester];

}

or

bool Course::isOffered(int semester)

{

if (semOffered[subscript] == true)

return true;

else

return false;

}

5. Given these declarations: Course c;

int s;

Show how a client would call the function you wrote for #4 to find out if Course c is being offered in semester s (assume appropriate values have been assigned to c and s). Print YES if the course is usually offered or NO if it is not.

if (c.isOffered(s))

cout << “YES” << endl;

else

cout << “NO” << endl;