Unit 1 - AP Computer Science Test

4

Consider the following code segment. int num = 5; num *= 2; num %= 6; What is the value of num after the code segment is executed?

The variable x should be declared as a double and the variable y should be declared as a boolean.

Consider the following code segment: /* data type 1 */ x = 0.5; /* data type 2 */ y = true; What best describes the data types that should be used to replace /* data type 1 */ and /* data type 2 */ so that the code segment compiles without error?

I only

Each of the following code segments is intended to print the word Hello. Which of the following code segments works as intended? I. System.out.print("Hello"); II. System.out.print(Hello); III. System.out.print(He); System.out.print(llo);

20

Consider the code segment below. int x = 10; int y = 20; System.out.print(y + x / y); What is printed as a result of executing the code segment?

3.0

Consider the following code segment. int a = 1; int b = 2; int c = 3; int d = 4; double x = a + b * c % d; What is the value of x when the code segment has been executed?

3 1.5

Consider the following code segment. double a = 7; int b = (int) (a / 2); double c = (double) b / 2; System.out.print(b); System.out.print(" "); System.out.print(c); What is printed as a result of executing the code segment?

II and III only

Which of the following arithmetic expressions evaluates to 1? I. 2 / 5 % 3 II. 2 / (5 % 3) III. 2 / 5 + 1

double patientTemp;

Which statement correctly declares a variable that can store a temperature rounded to the nearest tenth of a degree? A. boolean patientTemp; B. double patientTemp; C. int patientTemp; D. patientTemp = 0; E. patientTemp = 0.0;

The code segment does not work as intended for some values of len1, len2, and len3. The code segment works only works when the sum of the three lengths is an integer or the decimal part of the sum of the three lengths is greater than or equal to 0.5.

A store sells rope only in whole-foot increments. Given three lengths of rope, in feet, the following code segment is intended to display the minimum length of rope, in feet, that must be purchased so that the rope is long enough to be cut into the three lengths. For example, for lengths of 2.8 feet, 3 feet, and 5 feet, the minimum length of rope that must be purchased is 11 feet. For these inputs, the code segment should display 11. As another example, for lengths of 1.1 feet, 3.2 feet, and 2 feet, the minimum length of rope that must be purchased is 7 feet. For these inputs, the code segment should display 7. double len1; double len2; double len3; double total = len1 + len2 + len3; int minLength = (int) (total + 0.5); System.out.print(minLength); Which of the following best describes the behavior of the code segment? A. The code segment works as intended for all nonnegative values of len1, len2, and len3. B. The code segment does not work as intended for some values of len1, len2, and len3. The code segment works only works when the sum of the three lengths is an integer or the decimal part of the sum of the three lengths is greater than or equal to 0.5. C. The code segment does not work as intended for some values of len1, len2, and len3. It could be corrected by casting len1, len2, and len3 to int before adding them together and assigning the sum to minLength. D. The code segment does not work as intended for some values of len1, len2, and len3. It could be corrected by declaring minLength as a double and casting it to an int in the System.out.print statement. E. The code segment does not work as intended for any values of len1, len2, and len3. It returns the sum of 0.5 and the three lengths for all values of len1, len2, and len3.

int totalPoints; double percentage;

A teacher determines student percentages in a course as the points a student earns divided by the total points available in the grading period. Points are awarded only in whole number increments, but student percentages are to be stored as decimals. The following code segment appears in a program used to compute student percentages. Points that a student earns are stored in pointsEarned, the total points available in the grading period are stored in totalPoints, and the student percentage is stored in percentage. int pointsEarned; /* missing code */ Which of the following is most appropriate to replace /* missing code */ in the program? A. int totalPoints; int percentage; B. double totalPoints int percentage; C. int totalPoints; double percentage; D. int totalPoints; boolen percentage; E. double totalPoints; boolean percentage;

The code segment stores 17.5 in avg because 17.5 is the result of the floating point division of 35.0 by 2.

Consider the following code segment, which is intended to calculate the average of two quiz scores. double avg = 15 + 20; avg /= 2; Which of the following best describes the behavior of the code segment? A. The code segment stores 17 in avg because 17 is the result of the integer division of 35 by 2. The code segment stores 17 in avg because 17 is the result of the integer division of 35 by 2. B. The code segment stores 18 in avg because 18 is the result of the integer division of 35 by 2. The code segment stores 18 in avg because 18 is the result of the integer division of 35 by 2 . The code segment stores 17.5 in avg because 17.5 is the result of the floating point division of 35.0 by 2. C. The code segment stores 17.5 in avg because 17.5 is the result of the floating point division of 35.0 by 2 . D. The code segment does not compile because int values cannot be assigned to double values. E. The code segment does not compile because int values cannot be assigned to double values., The code segment does not compile because a double value cannot be divided by an int value.

The code should have cast either num1 or num2 in the expression num1 / num2 to double

Consider the following code segment, which is intended to display 0.5. int num1 = 5; int num2 = 10; double ans = num1 / num2; System.out.print(ans); Which of the following best describes the error, if any, in the code segment? A. There is no error and the code works as intended B. The code should have cast the expression num1 / num2 to double. C. The code should have cast either num1 or num2 in the expression num1 / num2 to double D. The code should have declared ans as an int. E. The code should have initialized num1 to 5.0 and num2 to 10.0

Either the numerator or the denominator of the fraction 1 / 2 should be cast as double.

Consider the following code segment, which is intended to display 6.0. double fact1 = 1 / 2; double fact2 = 3 * 4; double product = fact1 * fact2; System.out.println(product); Which of the following best describes the error, if any, in the code segment? A. There are no errors and the code works as intended. B. Either the numerator or the denominator of the fraction 1 / 2 should be cast as double C. The expression fact1 * fact2 should be cast as double D. The expression 1 / 2 and 3 * 4 should be cast as double E. The variables fact1 and fact2 should both be declared as int

Hello!How are you?

Consider the following code segment. System.out.print("Hello!"); System.out.println("How "); System.out.print("are "); System.out.print("you?"); What is printed as a result of executing the code segment?

Changing print to println in lines 1 and 2

Consider the following code segment. System.out.print("Ready"); // Line 1 System.out.print("Set"); // Line 2 System.out.print("Go!"); // Line 3 The code segment is intended to produce the following output but may not work as intended. Ready Set Go! What change, if any, can be made so that the code segment produces the intended output?

cat dog horse cow

Consider the following code segment. System.out.print("cat "); System.out.println("dog "); System.out.println("horse "); System.out.print("cow "); What is printed as a result of executing the code segment?

W X YZ

Consider the following code segment. System.out.println("W"); System.out.println("X"); System.out.print("Y"); System.out.print("Z"); What is printed as a result of executing the code segment?

Enclosing hello in line 1 and world in line 2 in quotation marks

Consider the following code segment. System.out.println(hello); // Line 1 System.out.print(world); // Line 2 The code segment is intended to produce the following output but does not work as intended. hello world What changes can be made so that the code segment produces the intended output?

-2.5

Consider the following code segment. double d = 0.25; int i = 3; double diff = d - i; System.out.print((int)diff - 0.5); What is printed as a result of executing the code segment?

11 0

Consider the following code segment. double p = 10.6; double n = -0.2; System.out.println((int) (p + 0.5)); System.out.print((int) (n - 0.5)); What is printed as a result of executing the code segment?

12 20

Consider the following code segment. int j = 10; int k = 8; j += 2; k += j; System.out.print(j); System.out.print(" "); System.out.println(k); What is printed when the code segment is executed?

It sets z to (x/y) + 2

Consider the following code segment. int x = /* initial value not shown */; int y = /* initial value not shown */; int z = x; z /= y; z += 2; What best describes the behavior of the code segment?

4

Consider the following code segment. int x = 0; x++; x += 1; x = x + 1; x -= -1; System.out.println(x); What is printed when the code segment has been executed?

II only

Consider the following code segment. int x = 10; int y = 20; /* missing code */ System.out.print(top / bottom); Which of the following replacements for /* missing code */ will cause an ArithmeticException to occur? I. int top = x - y; int bottom = y - x; II. int top = 2 * x; int bottom = y - top; III. int top = x + y; int bottom = 2 * top;

x+1

Consider the following code segment. int x; int y; x = 3; y = /* missing expression */; x = 1 + 2 * y; System.out.print(x); System.out.println(y); What can be used as a replacement for /* missing expression */ so that the code segment prints 94 ? A. 3 B. x C. x-1 D. x+1 E. 1-2*x

Both the value of x and the value of y have been decreased

Consider the following code segment. int x = 4; int y = 6; x -= y; y += x; Which of the following best describes the behavior of the code segment? A. The value of x and the value of y have not been changed. B. Both the value of x and the value of y have been decreased. C. Both the value of x and the value of y have been increased. D. The value of x has been decreased and the value of y has been increased. E. The value of x has been increased and the value of y has been decreased.

I, II, III only

The volume of a cylinder is equal to the height times the area of the circular base. The area of the circular base is equal to π (pi) times the square of the radius. The code segment below is intended to compute and print the volume of a cylinder with radius r and height h. Assume that the double variables r, h, and pi have been properly declared and initialized. /* missing code */ System.out.print(volume); Which of the following can be used to replace /* missing code */ so that the code segment works as intended? I. double baseArea = pi*r* r; double volume = baseArea * h; II. double volume = pi*r*r; volume = volume * h; III. double volume = pi*r*r*h;