AP CSA unit 1 - 4 TEST

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?

• WXYZ

• W

  XYZ

• WX

  YZ

• W

  X

  YZ

• W

  X

  Y

  Z

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;

• I. only

• II. only

• III. only

• I. and II.

• II. and III.

Consider the following code segment.

String str = "AP";

str += "CS " + 1 + 2;

System.out.println(str);

What is printed as a result of executing the code segment?

• CS AP12

• AP CS3

• CSAP 12

• APCS 12

• APCS 3

Consider the following method.

public double calculate(double x)

{

return x + 1.5;

}

The following code segment calls the method calculate in the same class.

Double d1 = new Double(7.5);

System.out.println(calculate(d1));

What, if anything, is printed when the code segment is executed?

• 8.0

• 8.5

• 9

• 9.0

• Nothing is printed because the code does not compile. The actual parameter d1 passed to calculate is a Double, but the formal parameter x is a 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?

• There are no errors and the code works as intended.

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

• The expression fact1 * fact 2 should be cast as double.

• The expressions 1 / 2 and 3 * 4 should both be cast as double.

• The variables fact1 and fact2 should both be declared as int.

What is the expected output?

• -1

• 0

• 1

• 17

• 18

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

The boolean expression (A || B) && A is true

• whenever A is true

• whenever B is true

• whenever either A is true or B is true

• whenever both A is true and B is true

• In all cases

Which java statement correctly implements the following pseudocode: display "A" when the student's grade is higher than 90 (inclusive)

• if (studentGrade = 90)

• if (studentGrade > 90)

• if (studentGrade >= 90)

• if (studentGrade < 90)

What is output by the following code?

• 11

• 31

• 15

• error