AP CS A Test #2

Consider the following code segment:

int x = 3;

double y = Math.pow(x, 3);

double z = Math.sqrt(y - Math.abs(-2));

What is the value of z after this code segment has executed?

• 0.0

• 3.0

• 5.0

• 9.0

• 10.0

What does the expression "Nomnomnom yummy turkey".indexOf("Thank") evaluate to?

• Thank

• Nomnomnom

• turkey

• -1

• 0

Consider the following code segment.

int x = /* some integer value */ ;

int y = /* some integer value */ ;

boolean result = (x < y);

result = ( (x >= y) && !result );

Which of the following best describes the conditions under which the value of result will be true after the code segment is executed?

• Only when x < y

• Only when x >= y

• Only when x and y are equal

• The value will always be true .

• The value will always be false .

Consider the following instance variables and incomplete method that are part of a class that represents an item. The variables years and months are used to represent the age of the item, and the value for months is always between 0 and 11, inclusive. Method updateAge is used to update these variables based on the parameter extraMonths that represents the number of months to be added to the age.

private int years;

private int months; // 0 <= months <= 11

public void updateAge(int extraMonths)

{

/* body of updateAge */

}

Which of the following code segments shown below could be used to replace /* body of updateAge */ so that the method will work as intended?

I int yrs = extraMonths % 12;

int mos = extraMonths / 12;

years = years + yrs;

months = months + mos;

II int totalMonths = years * 12 + months + extraMonths;

years = totalMonths / 12;

months = totalMonths % 12;

III int totalMonths = months + extraMonths;

years = years + totalMonths / 12;

months = totalMonths % 12;

• I only

• II only

• III only

• I and II only

• II and III

Consider the following method.

public static void conditionalTest(int a, int b)

{

if ((a > 0) && (b > 0))

{

if (a > b)

System.out.println("A");

else

System.out.println("B");

}

else if ((b < 0) || (a < 0))

System.out.println("C");

else

System.out.println("D");

}

What is printed as a result of the call conditionalTest(3, -2) ?

• A

• B

• C

• D

• Nothing is printed

Consider the following static method.

public static int calculate(int x)

{

x = x + x;

x = x + x;

x = x + x;

return x;

}

Which of the following can be used to replace the body of calculate so that the modified version of calculate will return the same result as the original version for all possible values of x ?

• return 3 + x;

• return 3 * x;

• return 4 * x;

• return 6 * x;

• return 8 * x;

Assume that a and b are boolean variables and have been properly initialized.

(a && b) || !(a && b)

The result of evaluating the expression above is best described as:

• Always true

• Always false

• true only when a is true and b is true

• true only when a and b have the same value

• true only when a and b have different values

1. Consider the following code segment.

for (int outer = 0; outer < n; outer++)

{

for (int inner = 0; inner <= outer; inner++)

{

System.out.print(outer + " ");

}

}

If n has been declared as an integer with the value 4, what is printed as a result of executing the code segment?

• 0 1 2 3

• 0 0 1 0 1 2

• 0 1 2 2 3 3 3

• 0 1 1 2 2 2 3 3 3 3

• 0 0 1 0 1 2 0 1 2 3

Consider the following code segment.

for (int i = 1; i <= 4; i++)

{

for (int j = 1; j <= 3; j++)

{

System.out.print("#");

}

System.out.println();

}

Which of the following is true about this code segment?

• It displays a rectangle made out of # symbols with height=4 and width=3.

• It displays a rectangle made out of # symbols with height=3 and width=4.

• It displays a triangle made out of # symbols with height=3 and base=4.

• It displays a line segment of # symbols with length=12.

• Nothing is displayed.

5. Consider the following incorrect program:

public class ComplicatedExample {

public static final int MAX = 3;

public static void twice() {

int x = 0;

for (int i = 0; i < MAX*4; i += 2) {

x++;

}

System.out.println("twice is " + x);

}

public static void main(String[] args) {

int y = 3;

for (int number = 0; number < y; number++) {

twice();

}

System.out.println("number is " + number);

}

}

Which variable is incorrectly accessed outside of its scope?

• x

• y

• number

• MAX

• args