Variables

Consider the following code:

var a = 0

var b = 2

var c = 6

a = a+b

b=a+c

c=a+b

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

• a= 0 b=2 c=6

• a=2 b=6 c=2

• a=2 b=2 c=8

• a= 2 b=8 c=10

If you wanted to check to see if two numerical values were equal, which operator would you use in coding?

• ==

• equals

• !=

• =

If you wanted to assign a value to some variable, which operator would you use?

• ==

• =

• !=

• equals

Which of the following is not an action a programmer should take when debugging a segment of code?

• Display the value of variables at various points during the program

• Ask a friend or collaborator to look over the code segment to see if they are able to find any errors

• Delete all the code and re-type it

• Check the names of each variable for spelling and capitalization errors

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

var x = 10;

increase();

x = x+3;

console.log(x);

function increase(){

var x =5}

• 5

• 8

• 10

• 13

• Error. Cannot make a new variable x inside function increase()

Finding and fixing problems in your algorithm or program

• debugging
• hacking
• cracking
• problem solving

A placeholder for a piece of information that can change

• Variable
• Proxy
• Element
• Condition

What will be displayed?

var a = 6;

while (a >= 2){

a = a - 1;

}

console.log(a);

• 1

• 2

• 6

• infinite loop

Can you explain your reasoning behind your answer in this code?

var a = 5;

while (a >= 2){

a = a - 1;

}

console.log(a);

• this in an infinite loop

• anytime that I press "run", the code rerun from the beginning value (a=2) and the console gives the result 1

• When I press run, the first value of a is 6, then this is reduced by 1, so the console gives 4

• This code continuously decrease the value of a

A custom variable can be created by using these steps

• Declaring, Initiating, Applying into the code

• Initiating, assigning the first value, using in the code

• Assigning a value, changing by a rule, using in a code

• ConditionNone of the above is correct