AP CS A Unit 3

Consider the following code, assuming grade is an int:

Which of the following will always produce the same result as the code above, regardless of the value of grade? (multiple correct answers)

• 
• 
• 

What is output by the following code?

• 11

• 15

• 31

• error

Consider the following incomplete code segment.

Consider the following potential replacements for /* missing code */ . Which of these replacements will cause

the code segment to always print false ? Assume that Math is imported correctly into our program.

• (int)(Math.random() * 10) + 20

• (int)(Math.random() * 10) + 25

• (int)(Math.random() * 10) + 30

• (int)(Math.random() + 30)

Given the variables, which boolean condition is true?

int a = 10;

int b = 10;

• a < b && a == b

• a < b && a != b

• a > b || a != b

• b >= a && a >= b

The following if statement tests the snowfall in Alaska during the months of December, January and February.

Assume low represents a threshold determined to be the least amount of snow required to be normal and high

represents a threshold determined to be the most amount of snow required to be normal and snow represents the

amount of snow in inches for that month. All variables are doubles. It could be replaced with:

• 
• 
• 

The following truth table matches which boolean condition?

• A && ( A || B )

• !A && ( A || !B )

• A && ( A && B )

• A || ( A || B )

A weather app records the current temperature to the nearest degree Fahrenheit using an int variable temp.

The app also uses a String variable tempAdj to store an adjective based on the value of temp which will be used

in a short written summary of the current weather. The values of tempAdj are determined as follows:

Which of the following code segments will correctly set the value of tempAdj for any given value of temp? (Multiple correct answers)

• 
• 
• 

To test if a grade (represented by the double variable g) is a B (between 80 - inclusive - and 90 exclusive) you

would use the following if statement:

What set of three symbols correctly fills in the blanks in the order they appear?

if (g ___ 90 ___ g ___ 90)

• >=, &&, <

• >, ||, <=

• >=, ||, <

• <=, &&, >

Consider the following expression. Assume that x and y are properly initialized boolean variables.

The result of evaluating the expression is best described as:

(x || y) && !(x && y)

• always true

• true only when x is true and y is true

• always false

• true only when x and y have the same

  values

• true only when x and y have different

  values

Consider the following code fragment, assume val is an int:

Which of the following code fragments would have the same effect?

if ( !(val != 50 && val >= 0))

• if (!(val == 50 || val < 0))

• if (val == 50 || val < 0)

• if (val == 50 || val > 0)

• if (val == 50 && val < 0)