The conversation between human and AI assistant.
[|Human|] Write a function that will return a rounded number.
[|AI|] Here's a function written in Python that takes a float as an input and returns a rounded number:

```python
def round_number(num):
    return round(num)

num = 4.5
print(round_number(num))
```
This function uses Python's built-in `round()` function to round the number to the nearest integer. The result of this example would be `4`.
[|Human|] 
Write a function that will return a rounded number.