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Difference Between Max and Min

Write a Python function `big_diff(nums)` that takes a list of integers `nums` as input and returns the difference between the largest and smallest values in the list.

#### Example Usage
```python [main.nopy]
print(big_diff([1, 2, 3, 4]))  # Output: 3
print(big_diff([4, 5, 12]))    # Output: 8
print(big_diff([9, 2, 3]))     # Output: 7
```

#### Constraints
- The input list will contain at least two integers.
- The integers in the list can be positive, negative, or zero.
def big_diff(nums):
    """
    Calculate the difference between the largest and smallest values in a list.

    Args:
        nums (list): A list of integers.

    Returns:
        int: The difference between the largest and smallest values.
    """
    # Placeholder for the solution
    pass