# den

den(x)

Denominator of the rational representation of `x`

## Examples

In the julia programming language, the function den(x)

Returns the denominator of the rational representation of `x`.

``````julia> den(2//3)
3``````

Provide common examples of its use. If there are any common mistakes users make, add an example.

1. Find the denominator of a rational number:

``````julia> r = 5//7;
julia> den(r)
7``````

This example retrieves the denominator of the rational number `r`.

2. Handle integers as input:

``````julia> num = 10;
julia> den(num)
1``````

When an integer is passed to `den`, it returns 1 since integers have a denominator of 1.

3. Use with floating-point numbers:
``````julia> f = 3.14;
julia> den(f)
1``````

If a floating-point number is provided, the `den` function returns 1 as floating-point numbers do not have a denominator.

Common mistake example:

``````julia> den("hello")
ERROR: MethodError: no method matching den(::String)``````

In this example, the input provided is a string, which is not a valid argument for `den`. It's important to ensure that the input to `den` is a rational number or a valid type for the function to avoid such errors.