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https://github.com/raminmammadzada/fuel-calculation-with-ruby

The Ruby CLI app to calculate the fuel needed for the interplanetary flight journey.
https://github.com/raminmammadzada/fuel-calculation-with-ruby

cli-app object-oriented-programming ruby

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The Ruby CLI app to calculate the fuel needed for the interplanetary flight journey.

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# Total Fuel Calculator with Ruby



## Description



The fuel required for the whole interplanetary flight journey was needed to be calculated. It is needed to calculate the amount of fuel to launch from one planet of the Solar system, and to land on another planet of the Solar system, depending on the flight route.



## Run app



You can run those functions in you own local environment. 



- Clone the repository by typing:



    ```git clone https://github.com/RaminMammadzada/fuel-calculation-with-ruby```



- Type ```./bin/main.rb``` in the root file of the project. ( You may need to update file permissions by typing ```chmod +x bin/main.rb ```)

​



- If you have an issuse related to file permissions, you can also easily type ```ruby bin/main.rb``` in the root file of the project.

​

## Details



Formula to calculate fuel is quite simple, but it depends on the planet's gravity. Planets the organizator is interested in are:



● Earth - 9.807 m/s



● Moon - 1.62 m/s



● Mars - 3.711 m/s



The formula for fuel calculations for the launch is the following:

mass * gravity * 0.042 - 33 rounded down

The formula for fuel calculations for the landing is the following:

mass * gravity * 0.033 - 42 rounded down

For example, for the Apollo 11 Command and Service Module, with a weight of 28801 kg, to land it

on the Earth, the required amount of fuel will be:

28801 * 9.807 * 0.033 - 42 = 9278



But fuel adds weight to the ship, so it requires additional fuel, until additional fuel is 0 or negative.



Additional fuel is calculated using the same formula from above.

9278 fuel requires 2960 more fuel

2960 fuel requires 915 more fuel

915 fuel requires 254 more fuel

254 fuel requires 40 more fuel

40 fuel requires no more fuel



So, to land Apollo 11 CSM on the Earth - 13447 fuel required (9278 + 2960 + 915 + 254 + 40).

Application should receive a flight route as 2 arguments. First one is the flight ship mass, and

second is an array of 2 element tuples, with the first element being land or launch directive, and

second element is the target planet gravity.

But take into account that to land a module on the Moon, you need additional fuel, which should

be launched from the Earth - we don’t have a refuel station in space - and we need to to carry

fuel for all steps from the very beginning.



For example, for the program to launch the ship from the Earth, land it on the Moon, and return

back to the Earth, input arguments will look like this:



Ruby - 28801, ```[[:launch, 9.807], [:land, 1.62], [:launch, 1.62], [:land, 9.807]]```

Elixir - 28801, ```[{:launch, 9.807}, {:land, 1.62}, {:launch, 1.62}, {:land, 9.807}]```

Python - 28801, ```[(9.807, 1.62), (1.62, 9.807)]```

And remember, you are hired by NASA, and reliability is crucial. We have no right for a mistake.



## Example cases



Here are examples of programs and required fuel for the whole mission:



1. Apollo 11:



● path: launch Earth, land Moon, launch Moon, land Earth



● weight of equipment: 28801 kg



● weight of fuel: 51898 kg



● arguments: ```28801, [[:launch, 9.807], [:land, 1.62], [:launch, 1.62], [:land, 9.807]]```



2. Mission on Mars:



● path: launch Earth, land Mars, launch Mars, land Earth



● weight of equipment: 14606 kg



● weight of fuel: 33388 kg



● arguments: ```14606, [[:launch, 9.807], [:land, 3.711], [:launch, 3.711], [:land, 9.807]]```






3. Passenger ship:



● path: launch Earth, land Moon, launch Moon, land Mars, launch Mars, land Earth



● weight of equipment: 75432 kg



● weight of fuel: 212161 kg



● arguments: ```75432, [[:launch, 9.807], [:land, 1.62], [:launch, 1.62], [:land, 3.711], [:launch, 3.711],[:land, 9.807]]```



## Run the tests



None of the tests added yet. It will be added with Rspec.



## Authors



👤 **Ramin Mammadzada**



- Github: [@RaminMammadzada](https://github.com/RaminMammadzada)

- Twitter: [@RaminMammadzada](https://twitter.com/RaminMammadzada)

- Linkedin: [@RaminMammadzada](https://www.linkedin.com/in/raminmammadzada) 



## 🤝 Contributing



Contributions, issues and feature requests are welcome!



Feel free to check the [issues page](https://github.com/RaminMammadzada/fuel-calculation-with-ruby/issues).



## Show your support



Give a ⭐️ if you like this project!



## 📝 License



This project is [MIT](lic.url) licensed.