AP CS A Unit 3

Front

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?

Back

Front

What is output by the following code? Options: 11, 15, 31, error

Back

11

Front

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. Options: (int)(Math.random() * 10) + 20, (int)(Math.random() * 10) + 25, (int)(Math.random() * 10) + 30, (int)(Math.random() + 30)

Back

(int)(Math.random() * 10) + 20

Front

Given the variables, which boolean condition is true? int a = 10; int b = 10; Options: a < b && a == b, a < b && a != b, a > b || a != b, b >= a && a >= b

Back

b >= a && a >= b

Front

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:

Back

Front

The following truth table matches which boolean condition?
Options: A && ( A || B ), !A && ( A || !B ), A && ( A && B ), A || ( A || B )

Back

A || ( A || B )

Front

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: if (g ___ 90 ___ g ___ 90). What set of three symbols correctly fills in the blanks in the order they appear?

Back

>= && <

Front

The result of evaluating the expression (x || y) && !(x && y) is best described as:

Back

true only when x and y have different values.

Front

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))

Back

if (val == 50 || val < 0)

Front

Which of the following is an example of short circuit evaluation?

if (y != 0 || x * y > 1)

Back

if y != 0 is true it doesn't evaluate x * y > 1