------
## 最终结论
```python
def decimal_to_Octal(n):
    result = ""
    if n == 0:
        return "0"
    while n > 0:
        result = str(n % 8) + result
        n //= 8
    return result

# Test cases
assert decimal_to_Octal(10) == '12'
assert decimal_to_Octal(2) == '2'
assert decimal_to_Octal(33) == '41'
```