## Question

In the example, how does fun_one know what m is?

## Answer

In the example, how does fun_one know what m is?

i. Since we’re using `fun_one()`

inside of `fun_two()`

, and `fun_two()`

accepts `m`

as a parameter, we

provide that value, whatever it may be, to `fun_one()`

to use as its own parameter – `n`

. Step by step,

what happens is:

1. We use `fun_two()`

and provide some argument for `m`

, like this: `fun_two(10)`

.

2. Inside, it makes a call to `fun_one()`

and passes `m`

(which we provided as 10) because it accepts

one argument.

3. `fun_one()`

takes 10 as its `n`

value and multiplies it by 5 and returns the resulting value – 50.

4. Back in `fun_two()`

we now have `50 + 7`

, so the function `return`

s 57, and that’s it!

Any time you’re unsure of how nested functions are working, it can be helpful to go through step by step like this, even writing it out on paper.