AP Computer Science Principles Unit 7 Review

Which code segment results in "true" being returned if a number is even? Replace "MISSING CONDITION" with the correct code segment.

function isEven(num){

if(MISSING CONDITION){

return true;

} else {

return false;

}

}

• num % 2 == 0;

• num % 0 == 2;

• num % 1 == 0;

• num % 1 == 2;

Here is the API for a robot library.

// moves the robot forward

function moveForward();

// turns the robot to the left

function rotateLeft();

// turns the robot to the right

function rotateRight();

// checks if a robot can move in any direction

// direction {string} - the direction to be checked

// return {Boolean} - true if the robot can move in that direction, otherwise returns false

function canMove(direction);

Which code segment will guarantee that the robot makes it to the gray square without hitting a wall or a barrier (black square)?

• 
• 
• 
• 

What will be printed to the console after this program runs?

var numbers = [2, 5, 3, 1, 6]

function changeNums(numList, addNum, subtractNum){

for(var i=0; i<numList.length; i++){

if(numList[i] % 3 == 0){

numList[i] = numList[i] + addNum;

} else {

numList[i] = numList[i] - subtractNum;

}

}

}

changeNums(numbers, 3, 2);

console.log(numbers);

• [2, 5, 3, 1, 6]

• [0, 3, 6, -1, 9]

• [-1, 2, 6, -2, 8]

• [5, 2, 6, 3, 9]

Which function calls would provide the most helpful test of this function?

Remember: With tests, you are attempting to figure out all the possible ways the function could be broken.

function findMin(num1, num2){

if(num1 < num2){

return num1;

} else {

return num2;

}

}

• findMin(-1, 0)

  findMin(2,4)

  findMin(5,10)

• findMin(5,3)

  findMin(7,2)

  findMin(5,1)

• findMin(1,1)

  findMin(-2,2)

  findMin(0,3)

• findMin(-1,1)

  findMin(1,-1)

  findMin(1,1)

You have imported a library with the birthMonth() function. Based on the API, how many strings are inputed to calculate the birth month?

// calculate birth month based on the day of the month, day of the week, and the birth year

// dayMonth {number} - a day of a month from 1 to 31

// dayWeek {string} - the name of the day of the week

// year {number} - the birth year

// return {string} - the month you were born

BirthdayLibrary.birthMonth(dayMonth, dayWeek, year);

• 1

• 4

• 0

• 3

listAverage() returns the average number in a list. Which of these functions does this correctly?

• 
• 
• 
• 

What is printed to the console?

console.log(15 % 4);

• 2

• 3

• 4

• 1

Which of the following is NOT true about procedural abstraction?

• Procedural abstraction improves code readability

• Procedural abstraction manages complexity by allowing for code reuse

• Procedural abstraction improves the speed at which a program executes

• Procedural abstraction allows a solution to a large problem to be based on the solution of smaller subproblems

This function checks if a character is a vowel. If it is, it returns true. Otherwise, it returns false.

Where should return false; be written in the code?

function checkVowel(character){

var vowels = ["a", "e", "i", "o", "u"];

for(var i=0; i<vowels.length; i++){

if(vowels[i] == character){

return true;

OPTION A

}

OPTION B

}

OPTION C

}

OPTION D

• OPTION A

• OPTION B

• OPTION C

• OPTION D

This function finds the minimum number in a list. What should <MISSING CODE SEGMENT> be replaced with in order for this function to operate as expected?

function min(numList){

var min = numList[0];

for(var i=0; i<numList.length; i++){

if(numList[i] < min){

<MISSING CODE SEGMENT>

}

}

return min;

}

• numList[i] = min;

• min = numList[i];

• min = numList;

• numList = min;