AP CSA Semester 1 Review

Front

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?

Back

W
X
YZ

Front

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;

Back

II. only

Front

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?

Back

APCS 12

Front

What is printed when the following code segment is executed?
String one = "ABC123";
String two = "C";
String three = "3";
System.out.println(one.indexOf(two));
System.out.println(one.indexOf(three));
System.out.println(two.indexOf(one));

Back

2
5
-1

Front

What is printed when the following code segment is executed?
public double calculate(double x)
{
return x + 1.5;
}
Double d1 = new Double(7.5);
System.out.println(calculate(d1));

Back

9.0

Front

The code segment below is intended to randomly print one of the values 2, 4, 6, or 8 with equal probability.
int val = /* missing code */ ;
val *= 2;
System.out.print(val);
Which of the following can be used to replace /* missing code */ so that the code segment works as intended?
Options: Math.random() * 4 + 1, Math.random() * 8, (int) (Math.random() * 4), (int) (Math.random() * 4 + 1), (int) (Math.random() * 8 + 1)

Back

(int) (Math.random() * 4 + 1)

Front

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?
Options: 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.

Back

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

Front

What is the expected output for this program? Options: 6, 12, error: incompatible types, error: identifier expected, error: missing return statement

Back

error: incompatible types

Front

What is the expected output? Options: -1, 0, 1, 17, 18

Back

17

Front

What does short circuit evaluation mean in the following code? if (a < b && c != d)

Back

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