```
public static class Fibonacci
{
public static (int closest, int next) GetClosestFibonacciNumbers(double number)
{
if (number < 0)
{
return (0, 1);
}

    int previous = 0;
    int current = 1;

    while (true)
    {
        int nextFibonacci = previous + current;

        if (nextFibonacci > number)
        {
            return (current, nextFibonacci);
        }

        previous = current;
        current = nextFibonacci;
    }
}
}
```
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