AP Computer Science A Variables Quiz & Flashcards

Questions and Answers

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

D. W X YZ

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

B. cat dog horse cow

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

D. Hello!How are you?

Which of the following changes can be made so that the following code segment produces the intended output? System.out.println(hello); // Line 1 System.out.print(world); // Line 2

Change print in line 2 to println Signup and view all the answers

Which change, if any, can be made so that the following code segment can output the intended result? System.out.print("Ready"); // Line 1 System.out.print("Set"); // Line 2 System.out.print("Go!"); // Line 3

Changing print to println in lines 1 and 2 Signup and view all the answers

Which of the following code segments works as intended to print the word Hello?

System.out.print("Hello"); Signup and view all the answers

Which statement correctly declares a variable that can store a temperature rounded to the nearest tenth of a degree?

B. double patientTemp; Signup and view all the answers

Which of the following is most appropriate to replace in the program to compute student percentages correctly? int pointsEarned; double percentage;

int totalPoints; Signup and view all the answers

Which of the following best describes the data types that should be used to replace x and y in the code segment x = 0.5; y = true;

D. The variable x should be declared as a double and the variable y should be declared as a boolean. Signup and view all the answers

Which of the following can be used as a replacement for y in the code segment to print 94? int x = 3; y = ; x = 1 + 2 * y; System.out.print(x); System.out.println(y);

D. x + 1 Signup and view all the answers

Which of the following can be used to replace the code segment so that it computes the volume of a cylinder correctly?

All of the above Signup and view all the answers

Which of the following replacements for top and bottom will cause an ArithmeticException to occur? int top = x - y; int bottom = y - x; System.out.print(top / bottom);

II only Signup and view all the answers

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

C. 3.0 Signup and view all the answers

Which of the following arithmetic expressions evaluates to 1?

II and III only Signup and view all the answers

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

B. 21 Signup and view all the answers

Study Notes

Output of Code Segments

Code segment printing "W", "X", "YZ" results in:
- W
- X
- YZ
Code segment with "cat ", "dog ", "horse ", "cow " produces:
- cat dog
- horse
- cow
Code segment with "Hello!", "How ", "are ", "you?" gives:
- Hello!How
- are you?

Modifying Print Statements

To fix a code segment that fails to produce the output "hello" and "world", change print to println in the relevant line.
To print "Ready", "Set", "Go!" correctly, change print to println on the first two lines.

Variable Declaration

Correct declaration for temperature storage:
- double patientTemp;

Calculating Percentages

Appropriate data type replacement for storing total points and percentage:
- int totalPoints;
- double percentage;

Data Type Usage

x should be a double and y should be a boolean for proper compilation without errors.

Mathematical Expressions and Outputs

To achieve the output "94" in a specific code segment, use:
- x + 1 as a replacement value.
For cylinder volume calculation:
- All provided options (I, II, III) correctly compute the volume using proper formulas.

Exception Handling

An ArithmeticException will occur with the replacement for top and bottom:
- Option II (where bottom evaluates to zero).

Example Calculations

The value of x from the expression involving variables a, b, c, d, evaluated as:
- Result is 3.0.
Arithmetic expressions giving a result of 1:
- Options II (2 / (5 % 3)) and III (2 / 5 + 1) are correct.

Expression Evaluations

Output from the code segment involving x and y result in a specific sum based on arithmetic operations.

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Description

Test your understanding of Java output with these flashcards from the AP Computer Science A curriculum. Each card presents a code segment and asks for the expected output, helping to reinforce your programming skills.

AP Computer Science A Flashcards