# Math

To get familiar with the Wipple Playground, let's start by writing a simple calculator! Copy and paste each example into the playground using the button. Make sure to delete what's already in the editor before pasting in each new example.

Alright, here's our first example:

``````2 + 2
``````

...wait, nothing happened. Why not?

## Computers do exactly what you tell them to do

The problem is that you told the computer to add 2 and 2 together, but you didn't tell it what to do with the result! So the answer (`4`) is just discarded. Remember that computers always do exactly what you tell them to do, and never anything you don't. To fix this, we can add `show` to the front of our calculation, which instructs the computer to display it on the screen:

``````show (2 + 2)
``````

Hooray, now `4` appears on the screen! Try changing the numbers and experiment with other symbols, and see what happens.

## Some more examples

Copy this code into the playground! Can you guess what the output will be?

``````show 1
show (1 + 1)
show (1 - 1)
show (2 * 3)
show (3 / 4)
show (0.1 + 0.2)
show (1 / 0)
``````

What do you notice about writing code over multiple lines?

## More complex calculations

You can use Wipple as a full calculator by grouping calculations with parentheses. Try it out!

``````show (2 + 2 + 2)
show (1 - (2 + 3))
show ((3 + 2) / 10)
show ((2 + 2) * (2 + 3 * 2))
``````

OK, now that you've hopefully got the hang of the playground, let's move on to something more interesting!