AP Computer Science - Midterm Solutions

True/False:

F 1. There are 8 bytes in a bit.
T 2. An example of an output device would be a monitor.
T 3. An interpreter or compiler translates a source program into a readable output for the user.
T 4. An integer can have the type double in Java.
F 5. This line in a program will display the number 45 for its output… System.out.println(“95”);
F 6. Keyboards are considered software.
T 7. In Java, // This is an appropriate symbol to make a comment.
T 8. A Java program is executed from the main method in the class.
T 9. double $tarter$; // This could be an identifier or variable.
F 10. double 4star; // This could be an identifier or variable.
F 11. System.out.printf(“%.2f” + 25.444); will print 25.44
T 12. System.out.printf(“%.2f%10s”, 2.2, “Hello”); will display: 2.20 Hello
T 13. If you want a number formatted in scientific notation you use %e.
F 14. Strings can be inserted into the formatting method by concatenating with +’s.
F 15. String is known as a primitive data type in Java.
T 16. char would be the best data type to input a letter grade (A, B, C…).
F 17. 3 + 25 – 1 would give the output 24.
T 18. If x=2 and z=3, the following will be false: (x <= z && x > 20)
F 19. The short circuit operations are true && (anything) and false || (anything).
T 20. Math.pow(Math.abs(3-6), Math.sqrt(4)) yields 9.

Short Answer:

Number 1

Determine if the following are equivalent using truth tables:

A	B	~(A and B)	~A or ~B
T	T	F	F
T	F	T	T
F	T	T	T
F	F	T	T

Circle: Yes or No

Number 2

Write a for loop that displays the following: 0 3 6 9 12 15 18 21 24
for ( int i=0 ; i <= 8 ; i++ )
System.out.print( i*3 + “ “ );

Number 3

Write the output (as the computer would) of the following program section:
int number = 0;
for ( i = 1; i <=4; i++) {
while ( i <= 2 ) { number = number * 2; i++ }
System.out.print(number + “ ”);
number = number + 2;
}
ANSWER:
0 2

Number 4

Draw a Venn Diagram for (A && !B) || !(A || B)

Number 5

Write the output (as the computer would) for: System.out.printf(“%.2f%6s\n%s”,24.5624,”Hello”,”GoodBye”);
ANSWER:
24.56 Hello
GoodBye

Vocabulary:

G 1. Boolean
F 2. Syntax
I 3. Truncate
H 4. Constructor
E 5. Class
K 6. final
L 7. Object
C 8. for
B 9. Method
J 10. while

Vocabulary Bank:

a. The section of a code in which a variable exists. SCOPE
b. A set of code which is referred to by name and can be called (invoked) at any point in a program simply by utilizing its name.
c. Used when you know how many times you need to loop.
d. A collection of data items, all the same type, in which each item's position is uniquely designated by an integer. ARRAY
e. The blueprint for which individual objects are created.
f. The rules of combining words to create statements, in other words how a Java program is written and interpreted.
g. The expression in an if or else-if statement must be of this type.
h. Creates new objects, has the same name as the class, and has no return type.
i. To shorten or cut off part of.
j. Used to loop until an event occurs.
k. A keyword in Java that declares a variable that cannot change.
l. A value of a class type.
Bonus: Identify the definitions that were not used by circling the letter and giving the definition.

Free Response

Finish the program where indicated:
public abstract class Shape {
private String name;
// Constructor
public Shape(String shapeName)
{ name = shapeName; }
public String getName()
{ return name; }
public abstract double area();
public abstract double perimeter();
public double semiPerimeter()
{ return perimeter()/2; }
}

public class Square extends Shape {
private double side;
// Constructor
public Square(double squareSide, String squareName) {
super(squareName);
side = squareSide;
}
public double perimeter()
{
// Write a return statement for perimeter
return side4;
}
public double area()
{
// Write a return statement for area
return sideside;
}
}

public class MAIN {
public static void main(String[] args) {
// Create (one line) a Square Object side length of 4 named “MySquare”.
// Hint: SUPERCLASS name = new SUBCLASS(side, “name”);
Shape MySquare = new Square(4, “MySquare);
// Print the perimeter, semiperimeter, area, and name of the new object in four separate print statements that also describe what it is printing.
System.out.println(“The perimeter is: ” + MySquare.perimeter());
System.out.println(“The semiperimeter is: ” + MySquare.semiPerimeter());
System.out.println(“The area is: ” + MySquare.area());
System.out.println(“The name is: ” + MySquare.getName());
}
}

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