101 CompSci S1 C
THE UNIVERSITY OF AUCKLAND
FIRST SEMESTER, 2003
COMPUTER SCIENCE
Principles of Programming
TERMS TEST
(Time allowed: 60 MINUTES)
Surname:
Forenames:
Student ID number:
Login name (UPI):
INSTRUCTIONS:
Attempt ALL questions - write your answers in the box provided
Calculators are NOT permitted
LAB GROUP:
Please circle the ONE lab group session below to which you belong
When your test is marked, it will be handed back during the lab you specify below
Mon 9-11
Tue 9-11
Wed 9-11
Thu 9-11
Fri 9-11
Mon 11-1
Tue 11-1
Wed 11-1
Thu 11-1
Fri 11-1
Mon 1-3
Tue 1-3
Wed 1-3
Thu 1-3
Fri 1-3
Mon 3-5
Tue 3-5
Wed 3-5
Thu 3-5
Wed 5-7
Question/Answer Sheet
- Page 2 -
CompSci 101 S1 C
SURNAME: ...................................................... FORENAMES: ...........................................................
RESULTS:
For examiner to complete (DO NOT FILL IN):
Question
Mark
Question
Mark
1
(/20)
5
(/10)
2
(/10)
6
(/15)
3
(/10)
7
(/10)
4
(/15)
8
(/10)
TOTAL:
(/100)
CONTINUED
Question/Answer Sheet
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CompSci 101 S1 C
SURNAME: ...................................................... FORENAMES: ...........................................................
Question 1 (20 marks)
a) What is printed by the following?
System.out.println( 3 + 5.3 );
(1 mark)
b) What is printed by the following?
System.out.println( 3 / 2 + 1.0 );
(1 mark)
c) What is printed by the following?
System.out.println( 1.0 * 3 / 2 );
(1 mark)
d) What is printed by the following?
int a = 9;
double b = 1.5;
b = a;
System.out.println( b );
(1 mark)
CONTINUED
Question/Answer Sheet
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CompSci 101 S1 C
SURNAME: ...................................................... FORENAMES: ...........................................................
e) What is printed by the following?
int a = 3;
int b = 2;
a = b;
b = a;
System.out.println( a + b );
(1 mark)
f)
What is printed by the following?
System.out.println( 3.5 + (int)3.5 );
(1 mark)
g) What is printed by the following?
System.out.println( (double)3 + 2/3 );
(1 mark)
h) What is printed by the following?
System.out.println( 20 % 2 );
(1 mark)
CONTINUED
Question/Answer Sheet
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CompSci 101 S1 C
SURNAME: ...................................................... FORENAMES: ...........................................................
i)
What is printed by the following?
System.out.println( 20 % 3 );
(1 mark)
j)
What is printed by the following?
System.out.println( 20 % 30 );
(1 mark)
k) What is printed by the following?
System.out.println("Sum = " + 3 + 3.5);
(2 marks)
l) What is printed by the following?
System.out.println("Sum = \" + 3 + 3.5");
(2 marks)
CONTINUED
Question/Answer Sheet
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CompSci 101 S1 C
SURNAME: ...................................................... FORENAMES: ...........................................................
m) What is printed by the following?
System.out.println("\\\"+"+"\\");
(2 marks)
n) What is printed by the following?
System.out.println(Math.max(Math.min(1,4), Math.max(1,2)));
(2 marks)
o) What is printed by the following?
String x = "Hello";
String y = "Joe";
System.out.println(x.length() + y.length());
(2 marks)
CONTINUED
Question/Answer Sheet
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CompSci 101 S1 C
SURNAME: ...................................................... FORENAMES: ...........................................................
Question 2 (10 marks)
Using the values given for the variables below, evaluate the following boolean expressions:
boolean
boolean
boolean
boolean
int e =
int f =
(a)
a=
b=
c=
d=
3;
5;
true;
false;
true;
false;
(a && b) || (a && c)
(2 marks)
(b)
(a || b) && (b || d)
(2 marks)
(c)
(a && !b) && !(!a || d)
(2 marks)
(d)
(e >= f) || ((e+2) < f)
(2 marks)
(e)
(e < f) && (f != e)
(2 marks)
CONTINUED
Question/Answer Sheet
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CompSci 101 S1 C
SURNAME: ...................................................... FORENAMES: ...........................................................
Question 3 (10 marks)
What is the output when the following code is executed?
public class Q3{
public static void main(String[] args){
int num1 = 15;
int num2 = 34;
int num3;
if (num1>4 && num2<22){
num3 = num2-num1;
if (num3>30)
System.out.println("output 1");
else if (num3>20)
System.out.println("output 2");
else
System.out.println("output 3");
System.out.println("output 4");
}
else {
num3 = num2+num1;
if (num3<30)
System.out.println("output 5");
else if (num3<50 || num3%2==1)
System.out.println("output 6");
else
System.out.println("output 7");
System.out.println("output 8");
}
}
}
(10 marks)
CONTINUED
Question/Answer Sheet
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CompSci 101 S1 C
SURNAME: ...................................................... FORENAMES: 4 ...........................................................
Question (15 marks)
Complete the application below. Your application should ask the user to enter a year. Your
application should then print out whether that year was a leap year or not. The following screenshots
show two examples of this program:
Remember the rule for determining if a year is a leap year or not: Every year which is evenly
divisible by 4 is a leap year, except that a year which is also divisible by 100 is not a leap year,
unless it is divisible by 400, in which case it is a leap year after all.
You can assume that the readInput() method is provided.
import java.io.*;
public class LeapYear {
public static void main(String[] args) {
System.out.print("Enter the year: ");
int year = Integer.parseInt( readInput() );
}
//readInput method is declared here
private static String readInput() {
...
}
}
(15 marks)
CONTINUED
Question/Answer Sheet
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CompSci 101 S1 C
SURNAME: ...................................................... FORENAMES: ...........................................................
Question 5 (10 marks)
What is the output of the following program? You may find it useful to use the desk-checking
technique covered in lectures. The space on the facing page can be used to show the diagram you
used to desk-check the code (below).
public class Q5 {
public static void main(String[] args) {
int num = 3;
method1();
System.out.println("main() num: " + num);
System.out.println("main(): " + method2("Test", 1));
}
private static String method2(String letters, int i) {
int num = 2;
System.out.println("2. letters: " + letters);
return letters.substring(0,i);
}
private static void method1() {
int num = 5;
String word = "Happy, Happy, Joy, Joy";
word = method2(word, num+1);
System.out.println("1. num: " + num);
}
}
Show the output here:
C:/> java Q5
(10 marks)
CONTINUED
Question/Answer Sheet
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CompSci 101 S1 C
SURNAME: ...................................................... FORENAMES: ...........................................................
Show your working here:
CONTINUED
Question/Answer Sheet
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CompSci 101 S1 C
SURNAME: ...................................................... FORENAMES: ...........................................................
Question 6 (15 marks)
Complete the application below which asks the user to enter a String, and then prints out the String
surrounded by a box of stars (asterisks), as shown by the following screenshot.
Write a method called printStars() which will accept an integer number as a parameter. The
method should print out a row of stars with the length of the row equal to the parameter.
The main() method of your application should use the printStars() method to print the top
and bottom of the box.
import java.io.*;
public class Q6{
public static void main(String[] args){
System.out.print("Enter a String: ");
String input = readInput();
//COMPLETE THE MAIN METHOD HERE
}//end of the main method
//Assume the readInput method is declared here
private static String readInput(){
...
}
CONTINUED
Question/Answer Sheet
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CompSci 101 S1 C
SURNAME: ...................................................... FORENAMES: ...........................................................
//WRITE THE PRINTSTARS METHOD HERE
private static ______
printStars(_______________________){
}//End of the printStars method
}//End of the application
(15 marks)
CONTINUED
Question/Answer Sheet
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CompSci 101 S1 C
SURNAME: ...................................................... FORENAMES: ...........................................................
Question 7 (10 marks)
Examine the application below:
public class Q7 {
public static void main(String[] args) {
int[] values = new int[10];
for (int i = 0; i < values.length; i++) {
values[i] = i%3;
}
int count = 0;
for (int i = 0; i < values.length; i++) {
if (values[i] == 0)
count++;
}
System.out.println(count);
}
}
What is the output of the above application?
C:\> java Q7
(10 marks)
CONTINUED
Question/Answer Sheet
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CompSci 101 S1 C
SURNAME: ...................................................... FORENAMES: ...........................................................
Question 8 (10 marks)
Given the following paint() method:
public void paint(Graphics g) {
g.drawLine(50, 50, 50, 150);
g.drawLine(150, 50, 50, 100);
}
Accurately draw what would appear in the Frame below for which the paint() method above is
defined. The window below is 200 pixels wide and 200 pixels high.
(10 marks)
Question/Answer Sheet
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CompSci 101 S1 C
SURNAME: ...................................................... FORENAMES: ...........................................................
OVERFLOW PAGE
(If you have used this page, please indicate clearly under the
relevant question that you have overflowed to this page)