AP CSP - Standard 3 Review

Consider the following JavaScript code snippet:

function start() {
    var x = 5;
    quadrupleNumber(x);
}

function quadrupleNumber(x) {
    var quadX = 4 * x;
    console.log(quadX);
}

What will be the output when the start function is invoked?

• No output, there is a syntax error in the code.

• 20

• 15

• 10

What are the benefits of writing functions in programming?

• To make our code reusable across different parts of the program

• To enhance code readability by assigning a descriptive name to a set of instructions

• To eliminate the need for writing repetitive code

• All of the above

Identify the parameter in the function definition of quadrupleNumber below:

function quadrupleNumber(x){
var quadX = 4 * x;
println(quadX); }

• There is no parameter

• quadX

• println

• x

Identify the parameters used in the printNumbers function from the following code snippet:

function printNumbers(first, second, third){
println(first);
println(second);
println(third); }

• printNumbers

• println

• x, y, z

• first, second, third

Consider the following code snippet. What will be the output when it is executed?

function printNumbers(first, second, third){

println(first);

println(second);

println(third);

}

function start(){

var middle = 5; printNumbers(4, middle, 6);

}

• 4

  middle

  6

• 4middle6

• 4

  5

  6

• 456

To draw a circle using the drawCircle function at coordinates (300, 400) with a radius of 40 and the color blue, which function call is correct?

Here’s the function signature for reference:

function drawCircle(radius, color, x, y)

• drawCircle(radius, color, x, y);

• drawCircle(40, Color.blue, 300, 400);

• drawCircle(300, 400, Color.blue, 40);

• drawCircle(300, 400, 40, Color.blue);

Is it mandatory for functions to have parameters in programming?

• Yes, functions must always have parameters.

• No, functions can exist without parameters.

Which statement is used to return values from a function in most programming languages?

• function

• if

• return

• break

Consider the following JavaScript code snippet:

function doubleNumber(x){
return 2*x;
}
function start(){
var y = 4;
var doubledY = doubleNumber(y);
var result = doubleNumber(doubledY);
print(result); }

What will be the output when the start function is executed?

• 64

• 16

• 8

• 4

How many parameters are required by the function sum to execute properly?

Consider the following function definition:
function sum(first, second){
var result = first + second;
return result;
}

• 2

• 3

• 0

• 1