AP CSA Unit 3

What does short circuit evaluation mean in the following code?

i) if (a < b && c != d)

• if a < b is false it evaluates c != d

• if a < b is false it doesn't evaluate c != d

• if c != d is false it evaluates a < b

• f c != d is false it doesn't evaluate a < b

• if a < b is true it doesn't evaluate c != d

Which if statement below tests if the variable letter holds the char value #?

• if (letter == #)

• if (letter == "#")

• if (letter == '#')

• if (letter >= '#')

• if (letter = '#')

What is 0 0 1 1 1 0 0 0 in base ten?

• 54

• 55

• 56

• 57

• 58

What is 67 in binary?

• 0 1 0 0 0 0 1 0

• 0 1 0 0 0 0 1 1

• 0 1 0 0 0 1 1 0

• 0 1 0 0 0 1 1 1

• 0 1 0 0 1 1 1 0

Consider the following code:

String w = "Rapunzel";

for (int i = 0; i < w.length(); i++) {

System.out.print(w.charAt(i) + " ");

if (i%4 == 3)

System.out.println();

}

What is output?

• R a p u

  n z e l

• R a p

  n z e l

• R a p u n z e l

• u l

• R a p n z e

What does the String method substring() do?

• Returns a portion of the String.

• Tests two String objects for equality.

• Compares this String with a second String for greater than, equal to, or less than.

• Returns the character at a certain location as a char value.

• Returns the length of a String.

What does the following code do?

String w3 = "aardvark";

System.out.println(w3.charAt(w3.length() – 2));

• Prints the second letter in the String.

• Prints the second to last letter in the String.

• Prints the last letter in the String.

• Prints the first letter in the String.

• Causes an index out of bounds error.

Consider the following code:

String major = "Computer Science";

What is returned by the method call major.charAt(2)?

• 'C'

• 'o'

• 'm'

• "C"

• "Science"

What is the result of 3/2 in Java?

• 1.5

• 1.0

• 1

• 0

What is the result of 3.0/2 in Java?

• 1.5

• 1.0

• 1

• 0