Einstein

Even if you haven’t studied physics (recently or ever!), you might have heard that $E=mc^2$, wherein $E$ represents energy (measured in Joules), $m$ represents mass (measured in kilograms), and $c$ represents the speed of light (measured approximately as 300000000 meters per second), per Albert Einstein et al. Essentially, the formula means that mass and energy are equivalent.

In a file called einstein.py, implement a program in Python that prompts the user for mass as an integer (in kilograms) and then outputs the equivalent number of Joules as an integer. Assume that the user will input an integer. There should be a function called realativity, which takes an integer as input and returns an integer representing the equivalent number of Joules.

Tip

Recall that input returns a str, per input.
Recall that a str comes with quite a few methods, per string-methods.
Recall that Python comes with several built-in functions, per functions.

Before You Begin

Ensure you are in the root directory of the repository that you cloned to your machine.
Change directory to src/function_variables/ in your terminal window.
```
cd src/function_variables/
```
create or open the file einstein.py
```
code einstein.py
```
This is where you’ll write your program.

How to Test

Here’s how to test your code manually:

Run your program with python einstein.py. Type 1 and press Enter. Your program should output:
```
    90000000000000000
```
Run your program with python einstein.py. Type 14 and press Enter. Your program should output:
```
    1260000000000000000
```
Run your program with python einstein.py. Type 50 and press Enter. Your program should output
```
    4500000000000000000
```

You can execute the below to check your code using pytest from the root directory.

.\tests\function_variables\test_faces.py

A green output from running the test means it was successful. A red output means there is a bug in your code that you need to fix.

How to Submit

From github desktop or the command line, commit your changes and push them to your repository.

Codespaces

If you are using codespaces, you can commit your changes directly from the Codespace interface. Click on the Source Control icon in the left sidebar, then click on the "..." button and select "Commit to main". Enter a commit message and click "Commit".

Codespace terminal or your local terminal.

Note

You will need to have installed git-scm for this to work locally

At the /functions_variables $ prompt in your terminal:

git add -A

Add all changed files in the repository to be committed

git commit -m "your message here"

Commit all changes in the REPO with the comment “your message here“ note: If the file is not complete, adjust the comment to describes what is being committed

Note

Remember to replace "your message here" with a meaningful commit message that describes your changes.

git push

Push all changes to the repo.