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## Walkthroughs

- Before entrusting a subprogram to a computer, it is a good idea to put it through a dry run or walkthourgh.
- Take out an index card and write down the name of the function you want to study.
- Write down the names of the function variables in a table, since you will update them as you walk through the code.

> `int_name(n = 416)`
> `c` | `r`
> `416` | `""`

- When your function calls another function, you can either start another card, or assume that it performs correctly.

> `int_name(n = 416)`
> `c` | `r`
> `416` | `""`
> `digit_name(n = 4)`
> `Returns "four"`

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