**Negative numbers in arithmetic operations**

I read the instructions regarding the first project in **scientific programming with python certificate** and I have a question: can any of the two numbers we’re adding or subtracting be negative?

and either way, how should my project function cope?

As far as I saw, none of the examples given in the project instructions pointed a negative number.

**Your code so far**

**Your browser information:**

User Agent is: `Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/93.0.4577.82 Safari/537.36`

**Challenge:** Arithmetic Formatter

**Link to the challenge:**