17 ÷ 5 = 3.4 otherwise known as 3 with a remainder of 2
(because 3×5=15 and 17-15=2)

8 ÷ 4 = 2 with zero remainder
57 ÷ 8 = 7.125 or 7 remainder 1

In code, we use modulus (%) to find just the remainder. Examples:

let my_number = 17;

// Getting the remainder if divided by 5
let rem = my_number % 5;
console.log("The remainder when divided by 5 is: ", rem);

// Determine if the number is even (divisible by 2)
if (my_number % 2 == 0) {
    console.log("That's an even number.");
} else {
    console.log("That's an odd number.");
}

• AND - represented by &&

  The light will turn on if switch A and switch B are turned on.
  if (switch_A == "on" && switch_B == "on")

• OR - represented by ||

  The light will turn on if switch A OR switch B (or both) are on.
  if (switch_A == "on" || switch_B == "on)

Example 1: Determine if a number is between 5 and 10:

// the user gave us a number and it's stored in "user_number"
if (user_number > 5 && user_number < 10) {
    console.log("Your number is between 5 and 10");
}

Example 2: Is the number below 10 and either 4 or 6:

if (user_number < 10 && (user_number == 4 || user_number == 6)) {
    // Your code here
}

Mr. Squirrel has a strange number game he wants you to code. It involves three numbers. Follow the instructions below.

1. Ask the user if they want to play a game, if they enter affirmatively, play the game.

   Do you want to play a game? (y/n): 
   

2. Ask the user to enter a number. If they entered a number greater than 10 and less than fifty, tell them their next number should be greater than 50. (it's ok if they don't oblige)

3. Ask for a second number. If this number is even, tell the user their next number should be odd. If it's odd, tell them their next number should be even. (it's ok if they don't oblige)

4. Ask for a third and final number.

5. A set of three numbers is considered Squirrelly if their sum+1 is divisible by 10. Tell the user if their numbers are Squirrelly or not.

6. A set of three numbers is considered Jazzy if at least one of the numbers is divisible by 3. Tell the user if their numbers are Jazzy or not.

For the game above, we will assume that the user always enters a number when asked. But just thinking about our code - what if they don't?

Modify the game a little, as follows:

• Adjust the original intro question so that it defaults to "y". That is to say that if the user just hits Enter without typing anything, it assumes they entered "y".

  Do you want to play a game? [y]/n:

• Let's redefine "Jazzy" to be at least two of the numbers are divisible by 3. Change your code to reflect this.