CSA Study Guide

Question 1

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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?

Answer 1

D.
W
X
YZ

Question 2

Consider the following code segment:
/ data type 1 / x = 0.5;
/ data type 2 / y = true;
Which of the following 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?

Answer 2

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

Question 2

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;

Answer 2

B. II only

Question 2

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?

Answer 2

C. int totalPoints;
double percentage;

Question 2

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);
Which of the following can be used as a replacement for / missing expression / so that the code segment prints 94 ?

Answer 2

D. x + 1

Question 3

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;

Answer 3

E. I, II, and III

Question 4

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?

Answer 4

C. 3.0

Question 5

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

Answer 5

D. II and III only

Question 6

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?

Answer 6

E. 12 20

Question 6

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?

Answer 6

D. 20

Question 7

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?

Answer 7

E. 4

Question 8

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

Answer 8

D. It sets z to (x / y) + 2.

Question 8

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

Answer 8

C. 4

Question 9

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?

Answer 9

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.

Question 9

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?

Answer 9

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

Question 10

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?

Answer 10

B. -2.5

Question 10

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?

Answer 10

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

Question 10

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?

Answer 10

D. 11
0

Question 10

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?

Answer 10

C. 3 1.5

Question 11

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?

Answer 11

B. The code segment works as intended but only 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.

Question 12

Part A: Write a statement to create a LightSequence object gradShow that has the initial light sequence “0101 0101 0101”.
Write the statement below.

Answer 12

LightSequence gradShow = new LightSequence(“0101 0101 0101”);

Question 12

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?

Answer 12

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

Question 13

Part B: Write a statement that will call the display method to display the light sequence for the gradShow object.
Write the statement below.

Answer 13

gradShow.display();

Question 13

Part C: Write a statement that will be used to update the gradShow light sequence to “0011 0011 0011”.
Write the statement below.

Answer 13

gradShow.changeSequence(“0011 0011 0011”);

Question 14

Part D: Write a code segment that will call the insertSegment method to insert the segment "1111 1111" in the current sequence for gradShow at index 4. The resulting sequence will be stored in the string resultSeq. Write the code segment below.

Answer 14

String resultSeq = gradShow.insertSegment("1111 1111", 4);

Question 14

Part E: Assume that the string oldSeq has been properly declared and initialized and contains the string segment. Write a code segment that will remove the first occurrence of segment from oldSeq and store it in the string newSeq. Consider the following examples. If oldSeq is "1100000111" and segment is "11", then "00000111" should be stored in newSeq. If oldSeq is "0000011" and segment is "11", then "00000" should be stored in newSeq. If oldSeq is "1100000111" and segment is "00", then "11000111" should be stored in newSeq. Write the code segment below. Your code segment should meet all specifications and conform to the examples.

Answer 14

int index = oldSeq.indexOf(segment); String newSeq = oldSeq.substring(0, index) + oldSeq.substring(index + segment.length());

Question 14

Part F: Two lights will be arranged on a two-dimensional plane. The vertical distance between the two lights is stored in the double variable a. The horizontal distance between the two lights is stored in the double variable b. The straight-line distance between the two lights is given by the formula . Write a code segment that prints the straight-line distance between the two lights according to the formula above.

Answer 14

System.out.println(Math.sqrt(aa + bb));

Question 15

A student has created a Book class. The class contains variables to represent the following. An int variable called pages to represent the number of pages A boolean variable called isHardcover to indicate whether or not the book is hardcover The object story will be declared as type Book. Which of the following descriptions is accurate?

Answer 15

C. An attribute of the story object is isHardcover.

Question 16

A teacher has created a Student class. The class contains the following. An int variable called grade to represent the student's grade level A String variable called name to represent the student's name A double variable called average to represent the student's grade point average A method called updateAverage that updates the student's average. The object greg will be declared as type Student. Which of the following descriptions is accurate?