AP CSP 2020 Midterm Review

Programs written with functions run more quickly

• True

• False

Functions can help remove repeated code from a program

• True

• False

Replacing repeated code with a function will reduce the number of commands the computer needs to run

• True

• False

Functions are called once but can be declared many times

• True

• False

Which of the following describes a conditional statement?

• affects the sequential flow of control by executing different statements based on the value of a Boolean expression

• stores information as a number, String, or Boolean

• joins together two or more strings end-to-end to make a new string

• an ordered sequence of characters

Which of the following describes a variable?

• affects the sequential flow of control by executing different statements based on the value of a Boolean expression

• stores information as a number, String, or Boolean

• joins together two or more strings end-to-end to make a new string

• an ordered sequence of characters

Which of the following describes concatenation?

• affects the sequential flow of control by executing different statements based on the value of a Boolean expression

• stores information as a number, String, or Boolean

• joins together two or more strings end-to-end to make a new string

• an ordered sequence of characters

Consider the code segment below:

var a = 0;

var b = 3;

var c = 4;

a = a+c;

b = a+c;

c = a+c;

What are the values of a, b & c after this code segment has been run?

• a: 4 b: 4 c: 4

• a: 4 b: 8 c: 8

• a: 4 b: 8 c: 16

• a: 0 b: 3 c: 4

Jan is writing a shopping app. She has created a variable to keep track of the number of items in the shopping cart. Every time someone clicks the "addItemButton" she wants the variable to increase by 1.

var cartTotal = 0;

onEvent("addItemButton", "click", function(){

//<missing code>

console.log(cartTotal);

});

What code should Jan insert where it says <missing code> in order for her app to work?

• cart Total = 1;

• cartTotal + 1;

• cartTotal = cartTotal + 1;

• var cartTotal = cartTotal + 1;

• var cartTotal + 1;

What is the output to the console after the following code segment is executed?

fiveMore();

function fiveMore(){

var x = 5;

}

var y = 3 + x;

console.log(y);

• -2

• 3

• 5

• 8

• Error. Unknown Identifier: x