> For the complete documentation index, see [llms.txt](https://trizen.gitbook.io/sidef-lang/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://trizen.gitbook.io/sidef-lang/programming_tasks/c/case-sensitivity_of_identifiers.md).

# Case-sensitivity of identifiers

```ruby
var dog = 'Benjamin'
var Dog = 'Samba'
var DOG = 'Bernie'
say "The three dogs are named #{dog}, #{Dog}, and #{DOG}."
```

#### Output:

```
The three dogs are named Benjamin, Samba, and Bernie.
```