Unit 3 Test AP Comp Sci

if (a >= b && c == d) { System.out.println("cat"); } else { System.out.println("dog"); }

if (a < b || c != d) { System.out.println("dog"); } else { System.out.println("cat"); }

( a && b ) && ( !c && d )

!( !( a && b ) || ( c || !d )) Which of the following are equivalent to the expression?

I and III only

if (score >= 93)...

I and III only

suburban zip code

Only when B is true

(a && (b || !a)) == a && b Which of the following best describes the conditions under which the expression will evaluate to true?

x = 10 and y = 30

(x <= 10) == (y > 25) Which of the following values for x and y will result in the expression evaluating to true ?

II only

Boxes

choice > 10

Code Segment A if (choice > 10) { System.out.println("blue"); } else if (choice < 5) { System.out.println("red"); } else { System.out.println("yellow"); } Code Segment B if (choice > 10) { System.out.println("blue"); } if (choice < 5) { System.out.println("red"); } else { System.out.println("yellow"); } What describes initial conditions of variable choice? that will cause two code segments to product diff output?

Expression I and expression II evaluate to the same value only when A and B differ.

I. A && B II. !A && !B

true false true

String alpha = new String("APCS"); String beta = new String("APCS"); String delta = alpha; System.out.println(alpha.equals(beta)); System.out.println(alpha == beta); System.out.println(alpha == delta);

YY

What is printed as a result of the call message (5,15,5)?

II only

class Person

6

int start = 4; int end = 5; boolean keepGoing = true; if (start < end && keepGoing) { if (end > 0) { start += 2; end++; } else { end += 3; } } if (start < end) { if (end == 0) { end += 2; start++; } else { end += 4; } }

x = 4 y = -1

int x = 3; int y = -1; if (x - 2 > y) { x -= y; } if (y + 3 >= x) { y += x; } System.out.print("x = " + x + " y = " + y); What is printed as a result of the execution of the code segment

(y > 10000 || x > 1000) && (y > 10000 || x < 1500)

Assume that x and y have been declared and initialized with int values, consider the following Java expression. (y > 10000) || (x > 1000 && x < 1500)

The two code segments print the same value only when grade is below 80.

Consider the following code segments, which are each intended to convert grades from a 100-point scale to a 4.0-point scale and print the result. A grade of 90 or above should yield a 4.0, a grade of 80 to 89 should yield a 3.0, a grade of 70 to 79 should yield a 2.0, and any grade lower than 70 should yield a 0.0. Assume that grade is an int variable that has been properly declared and initialized. Code Segment I double points = 0.0; if (grade > 89) {points += 4.0;} else if (grade > 79) {points += 3.0;} else if (grade > 69) {points += 2.0;} else {points += 0.0;} System.out.println(points); Code Segment II double points = 0.0; if (grade > 89) {points += 4.0;} if (grade > 79) {grade += 3.0;} if (grade > 69) {points += 2.0;} if (grade < 70) {points += 0.0;} System.out.println(points); Which of the following statements correctly compares the values printed by the two methods?

B

String str1 = new String("Advanced Placement"); String str2 = new String("Advanced Placement"); if (str1.equals(str2) && str1 == str2) { System.out.println("A"); } else if (str1.equals(str2) && str1 != str2) { System.out.println("B"); } else if (!str1.equals(str2) && str1 == str2) { System.out.println("C"); } else if (!str1.equals(str2) && str1 != str2) { System.out.println("D"); }

boolean b2 = (num < -100) || (num > 0 && num < 100);

Which of the following statements assigns the same value to b2 as the code segment assigns to b1 for all values of num ?

boolean b2 = false && (17 % 3 == 2);

boolean b1 = true && (17 % 3 == 1); Which of the following assigns the same value to b2 as the value stored in b1 ?

false

boolean x = (5 < 8) == (5 == 8); What is the value of x after the statement has been executed?

75.0

double regularPrice = 100; boolean onClearance = true; boolean hasCoupon = false; double finalPrice = regularPrice; if(onClearance) { finalPrice -= finalPrice * 0.25; } if(hasCoupon) { finalPrice -= 5.0; } System.out.println(finalPrice); What is printed as a result of executing the code segment?

degrees = 95;

if (degrees > 95) { System.out.println("School will be closed due to extreme heat"); } else { System.out.println("School is open"); }

Third

if (false && true || false) { if (false || true && false) { System.out.print("First"); } else { System.out.print("Second"); } } if (true || true && false) { System.out.print("Third"); }

I and II only

if (x % 2 == 1) { System.out.println("YES"); } else { System.out.println("NO"); } Assuming that x is initialized to the same positive integer value as the original, which of the following code segments will produce the same output as the original code segment? I. if (x % 2 == 1) { System.out.print("YES"); } if (x % 2 == 0) { System.out.println("NO"); } II. if (x % 2 == 1) { System.out.println("YES"); } else if (x % 2 == 0) { System.out.println("NO"); } else { System.out.println("NONE"); } III. boolean test = x % 2 == 0; if (test) { System.out.println("YES"); } else { System.out.println("NO"); }

true

int a = 10; int b = 5 * 2; System.out.print(a == b);

randomNumber = 0.70;

int event = 0; if (randomNumber <= 0.70) { event = 1; } if (randomNumber <= 0.80) { event = 2; } else { event = 3; } which will show randomNumber does not work as intended?

27

int x = 7; if (x < 7) { x = 2 * x; } if (x % 3 == 1) { x = x + 2; } System.out.print(3 * x); What is printed as a result of executing the code segment?

value is: 2

int x = 7; int y = 3; if ((x < 10) && (y < 0)) System.out.println("Value is: " + x * y); Else System.out.println("Value is: " + x / y);

a= true, b = false, x = 7

int x = 7; int y = 4; boolean a = false; boolean b = false; if (x > y) { if (x % y >= 3) { a = true; x -= y; } else { x += y; } } if (x < y) { if (y % x >= 3) { b = true; x -= y; } else { x += y; } }

isLeapYear(1900)

public boolean isLeapYear(int val) { if ((val % 4) == 0) { return true; } else { return (val % 400) == 0; } }

6

public int pick(boolean test, int x, int y) { if (test) return x; else return y; } What value is returned by the following method call? pick(false, pick(true, 0, 1), pick(true, 6, 7))