Computer Science 162 – Spring 2000

02/25/2K Midterm Exam #1 Test Form A

Name:

Instructions:

Answer ALL questions on the answer sheet provided.

Hand in TEST, Answer Sheet, and Help Sheet, each with your name on it.

Remember to put the letter of your test form on your answer sheet.

Completion (3 points each)

1. Functions in C++ can be ________; this means that two different functions can have the same name. They can be distinguished based on the number and types of parameters, and the class the function belongs to.

2. A(n) ________ function in C++ runs when an object is declared, creating and initializing the data (data members) for the object. These have the same name as the class and no return type.

3. The data members and member functions in the ________ section of a class definition can be accessed by member functions, but NOT by client functions, such as main. That is, these are hidden or inaccessible to users of the object.

4. Some output manipulators, such as setprecision, fixed, and left, are ________, that is they remain in effect until they are changed; others, such as setw are not.

5. A(n) ________ is a data structure that is a general container for objects. Objects enter and exit at the same end (the top) – the last one in is the first one out (and vice versa).

Short Answer (points as shown)

(6 points)

6. If you are declaring a C++ member function that has a set of parameters, which parameters can have defaults specified in the definition?

Valid/Invalid (4 points each)

For each, tell whether valid or invalid. If invalid, tell why!

Use the following class definition for the questions 7-10.

class Thing {

public:

Thing();

Thing(Thing orig);

int GetValue();

void SetValue(int val);

private:

int Value;

};

7.

. // client code in main using Thing class defined above

Thing X;

Thing Y(X);

8.

. // client code in main using Thing class defined above

Thing X;

X.SetValue(4);

9.

. // client code in main using Thing class defined above

Thing X;

X.Value = 3;

Doing and Understanding: (points as shown)

(12 points)

10. Indicate the output from the following fragment of code

void mixit (int &a, int &b) {

int temp = a;

a = b;

b = temp;

}

int main () {

int x = 5;

int y = 7;

mixit(x,y);

cout << x << " " << y << endl;

}

(12 points)

11. Given the attached Account class definition, Indicate the output from the following fragment of code:

Account x(“1234”);

bool in = x.Deposit(100);

while (x.Withdraw(30)) {

cout << x << endl;

}

(13 points)

12. For the code fragment below using the string library, indicate the output:

string myWords = “I can’t believe the news today”;

int len = myWords.length();

int half = len / 2;

string begin = myWords.substr(0,half);

string end = myWords.substr(half,len – half);

cout << “len: “ << len << “ flopped: “ << end << “ “ << begin << endl;

Writing Code (points as shown)

Given the attached Card, Deck, and Player class definitions:

(5 points)

13. Write a declaration for an array of 5 cards.

(10 points)

14. In a game a Deck variable named deck1 has been created, shuffled, and some play has gone on. Write statements in main that will check if any cards remain in the deck, and if so draws a card, putting it in the variable currCard.

(15 points)

15. Assuming that a class called Employee has been defined as below, and you are in the middle of writing a main function and that you have already 1) declared an array of 20 employees called employs; 2) asked the user for employee name, and salary for all of the employees, and 3) updated the employee objects in the array with this information. Now, your job is to:

· give all employees a 10 percent raise

class Employee {

public:

Employee (); // default employee prototype

Employee (string name, double salary); // fully specified employee prototype

string GetName(); // report employee’s name

double GetSalary(); // report employee’s salary

void SetName(string nam); // set or change employee’s name

void SetSalary (double area); // set or change employee’s land area

void GiveRaise(double pct); // give an employee a raise of the given pct

private:

string emplName;

double emplSalary;

};